Art is a serious thing. But sometimes some associations once they pop up in your head they just can’t disappear.
I didn’t find any scientific evidence for it but when you look at Egon Schiele’s portraits and self-portraits it seems he had some kind of a hand fetish.
It is a recurring theme in the portraits of Schiele. The subject’s fingers are painted or drawn long in all kinds of open, twisted and strange symbolic gestures. Schiele’s hands and fingers are dislocated and unnatural. Often they are larger than the natural ones. Every knuckle and every joint are exaggerated and carefully articulated....
(http://www.dailyartdaily.com/10-times-egon-schiele-mastered-hip-hop-hand-gestures/)