One study found that slightly altering photographs to resemble the faces of study participants more closely increased the trust the participants expressed regarding depicted persons.
wˈʌn stˈʌdi fˈaʊnd ðæt slˈaɪtli ˈɔltɚɹɪŋ fˈoʊɾəɡɹˌæfz tə ɹᵻzˈɛmbəl ðə fˈeɪsᵻz ʌv stˈʌdi pɑːɹtˈɪsɪpənts mˈoːɹ klˈoʊsli ɪŋkɹˈiːst ðə tɹˈʌst ðə pɑːɹtˈɪsɪpənts ɛkspɹˈɛst ɹᵻɡˈɑːɹdɪŋ dᵻpˈɪktᵻd pˈɜːsənz.