5301991f_and_The_Art_of_Breaking_Things__detailed_explanation
[signal] Smile – head tilted, looking up [part of body] mouth [possible meaning(s)] playfulness, teasing, coy [detailed explanation] 
Head tilted sideways and downwards so as to part hide the face, from which the smile is directed via the eyes at the intended target.
“I pretty much try to stay in a constant state of confusion just because of the expression it leaves on my face.” – Johnny Depp | Zen and The Art of Breaking Things
detailed explanation