Studies on visually recognizable personality traits?
I am currently reading a book called "Snoop", written by researcher Sam Gosling (I recommend this very interesting book!). He's doing just the kind of research I am looking for, and thus I've found tons of research documents on these things:


  Our research focuses on the following issues:
  
  Everyday manifestations of personality – Which cues are reliably
  linked to what individuals are like?
  
  Everyday person perception – Which cues do individuals use to form
  their impressions of others?
  
  Consensus – Do observers agree with one another in their impressions
  of others?
  
  Accuracy – Are observers impressions of others accurate?
  
  Stereotype use – how do stereotypes hinder or promote consensus and
  accuracy?
  - http://gosling.psy.utexas.edu/current-research/everyday-manifestations-of-personality/


http://gosling.psy.utexas.edu/publications/

The expression and perception of personality in everyday life

Back, M. D., Stopfer, J. M., Vazire, S., Gaddis, S., Schmukle, S. C., Egloff, B., &amp; Gosling, S. D. (2010). Facebook profiles reflect actual personality not self-idealization. Psychological Science, 21, 372-374.

Carney, D. R., Jost, J. T., Gosling, S. D., &amp; Potter, J. (2008). The secret lives of liberals and conservatives: Personality profiles, interaction styles, and the things they leave behind. Political Psychology, 29, 807-840.

Gebauer, J. E., Bleidorn, W., Gosling, S. D., Rentfrow, P. J., Lamb, M. E., &amp; Potter, J. (in press). Cross-Cultural Variations in Big Five Relations with Religiosity: A Socio-Cultural Motives Perspective. Journal of Personality and Social Psychology.

Gosling, S. D., Augustine, A. A., Vazire, S., Holtzman, N., &amp; Gaddis, S. (2011). Manifestations of personality in Online Social Networks: Self-reported Facebook-related behaviors and observable profile information. Cyberpsychology, Behavior, and Social Networking, 14, 483-488. [DOI: 10.1089/cyber.2010.0087]

Gosling, S. D., Gaddis, S., &amp; Vazire, S. (2008). First impressions based on the environments we create and inhabit. In N. Ambady, &amp; J. J. Skowronski (Eds.), First Impressions (pp. 334-356). New York: Guilford.

Gosling, S. D., Gifford, R., &amp; McCunn, L. (2013). The selection, creation, and perception of interior spaces: An environmental psychology approach. In G. Brooker &amp; L. Weinthal (Eds.), The Handbook of Interior Design (pp. 278-290). Oxford, UK: Berg.

Gosling, S. D., Ko, S. J., Mannarelli, T., &amp; Morris, M. E. (2002). A Room with a cue: Judgments of personality based on offices and bedrooms. Journal of Personality and Social Psychology, 82, 379-398. [Available in pdf]

Gosling, S. D., Sandy, C. J., &amp; Potter, J. (2010). Personalities of self-identified “dog people” and “cat people.” Anthrozoös, 23, 213-222.

Graham, L. T., &amp; Gosling, S. D. (2012). Impressions of World of Warcraft players’ personalities based on their usernames: Interobserver consensus but no accuracy. Journal of Research in Personality, 46, 599-603.

Graham, L. T., &amp; Gosling, S. D. (2013). Personality profiles associated with different motivations for playing World of Warcraft. Cyberpsychology, Behavior, and Social Networking, 16, 189-193.

Graham, L. T., &amp; Sandy, C. J., &amp; Gosling, S. D. (2011). Manifestations of individual differences in physical and virtual environments. In T. Chamorro-Premuzic, S. von Stumm, &amp; A. Furnham (Eds.), Handbook of Individual Differences (pp. 773-800). Oxford: Wiley-Blackwell.

Mehl, M. R., Gosling, S. D., &amp; Pennebaker, J. W. (2006). Personality in its natural habitat: Manifestations and implicit folk theories of personality in daily life. Journal of Personality and Social Psychology, 90, 862-877.

Naumann, L. P., Vazire, S., Rentfrow, P. J., &amp; Gosling, S. D. (2009). Personality judgments based on physical appearance. Personality and Social Psychology Bulletin, 35, 1661-1671

Obschonka, M., Schmitt-Rodermund, E., Silbereisen, R. K., Gosling, S. D., &amp; Potter, J. (2013). The regional distribution and correlates of an entrepreneurship-prone personality profile in the United States, Germany, and the United Kingdom: A socioecological perspective. Journal of Personality and Social Psychology, 105, 104-122. [DOI: 10.1037/a0032275]

Rentfrow, P. J., Goldberg, L. R., Stillwell, D. J., Kosinski, M., Gosling, S. D., &amp; Levitin, D. J. (2012). The song remains the same: A replication and extension of the MUSIC model. Music Perception, 30,161-185. [DOI: 10.1525/MP.2012.30.2.161]

Rentfrow, P. J., &amp; Gosling, S. D. (2003). The do re mi’s of everyday life: The structure and personality correlates of music preferences. Journal of Personality and Social Psychology, 84, 1236-1256. [Available in pdf]

Rentfrow, P. J., &amp; Gosling, S. D. (2006). Message in a Ballad: The role of music preferences in interpersonal perception. Psychological Science, 17, 236-242. [Available in pdf]

Rentfrow, P. J., &amp; Gosling, S. D. (2007). The content and validity of music-genre stereotypes among college students. Psychology of Music, 35, 306-326.

Rentfrow, P. J., Gosling, S. D., Jokela, M., Stillwell, D. J., Kosinski, M., &amp; Potter, J. (2013). Divided We Stand: Three Psychological Regions of the United States and their Political, Economic, Social, and Health Correlates. Journal of Personality and Social Psychology, 105, 996-1012. [DOI: 10.1037/a0034434]

Rentfrow, P. J., Gosling, S. D., &amp; Potter, J. (2008). A theory of the emergence, persistence, and expression of geographic variation in psychological characteristics. Perspectives on Psychological Science, 3, 339-369.

Sandy, C. J., Gosling, S. D., &amp; Durant, J. (2013). Predicting Consumer Behavior and Media Preferences: The Comparative Validity of Personality Traits and Demographic Variables. Psychology and Marketing, 30, 937-949. [DOI: 10.1002/mar.20657]

Swann, W. B., Jr., Rentfrow, P. J., &amp; Gosling, S. D. (2003). The precarious couple effect: Verbally inhibited men + critical, disinhibited women = bad chemistry. Journal of Personality and Social Psychology, 85, 1095-1106. [Available in pdf]

Vazire, S., Naumann, L. P., Rentfrow, P. J., &amp; Gosling, S. D. (2009). Smiling reflects different emotions in men and women. Behavioral and Brain Sciences, 32, 403-405.

Vazire, S., Naumann, L. P., Rentfrow, P. J., &amp; Gosling, S. D. (2008). Portrait of a narcissist: Manifestations of narcissism in physical appearance. Journal of Research in Personality, 42, 1439-1447.

Vazire, S. &amp; Gosling, S. D. (2004). e-perceptions: Personality impressions based on personal websites. Journal of Personality and Social Psychology, 87, 123-132. [Available in pdf]

Wilson, R. E., Gosling, S. D., &amp; Graham, L. T. (2012). A review of Facebook research in the social sciences. Perspectives on Psychological Science, 7, 203-220. [DOI 10.1177/1745691612442904]

Anderson, C. P., Ames, D. R., &amp; Gosling, S. D. (2008) Punishing hubris: The perils of status self-enhancement in teams and organizations. Personality and Social Psychology Bulletin, 34, 90-101.

Erdle, S., Gosling, S. D., &amp; Potter, J. (2009). Does self-esteem account for the higher-order factors of the Big Five? Journal of Research in Personality, 43, 921-922.

Gosling, S. D., Sandy, C. J., &amp; Potter, J. (2010). Personalities of self-identified “dog people” and “cat people.” Anthrozoös, 23, 213-222.

Gosling, S. D., &amp; Srivastava, S. (2011). Changes in perceptions of George W. Bush’s personality in the wake of the September 11 2001 World Trade Center attacks. Acta de Investigación Psicológica, 3, 486-490.

Jost, J. T., Hawkins, C. B., Nosek, B. A., Hennes, E. P., Stern, C., Gosling, S. D., &amp; Graham, J. (2014). Belief in a Just God (and a Just Society): A System Justification Perspective on Religious Ideology. Journal of Theoretical and Philosophical Psychology, 34, 56-81. [Translated to: Jost, J. T., Hawkins, C. B., Nosek, B. A., Hennes, E. P., Stern, C., Gosling, S. D., &amp; Graham, J. (in press). Creencia en un dios justo: La Religión como una forma de Justificación del Sistema. Psicologia Politica, 47, 55-89.]

Mathieu, M. T., &amp; Gosling, S. D. (2012). The accuracy or inaccuracy of affective forecasts depends on how the question is framed: A meta-analysis of past studies. Psychological Science, 23, 161-162. [DOI: 10.1177/0956797611427044]

Pennebaker, J. W., Gosling, S. D., &amp; Ferrell, J. (2013). Daily online testing in large classes: Boosting college performance while reducing achievement gaps. PLOS ONE, 9, e79774. [doi:10.1371/journal.pone.0079774]

Ramírez-Esparza, N., Gosling, S. D., &amp; Pennebaker, J. W. (2008). Paradox lost: Unraveling the puzzle of Simpatia. Journal of Cross-Cultural Psychology, 39, 685-702.

Robins, R. W., Tracy, J. L., Trzesniewski, K. H., Potter, J., &amp; Gosling, S. D. (2001). Personality correlates of self-esteem. Journal of Research in Personality, 35, 463-482. [Available in pdf]

Vazire, S., Naumann, L. P., Rentfrow, P. J., &amp; Gosling, S. D. (2009). Smiling reflects different emotions in men and women. Behavioral and Brain Sciences, 32, 403-405.

Wood, D., Gosling, S. D., &amp; Potter, J. (2007). Normality evaluations and their relation to personality traits and well-being. Journal of Personality and Social Psychology, 93, 861-879.