Probably some idiot trying to be funny/spooky etc.

Yeah I bet whomever did those drawings came to them every night.
Whatever got them through the long days and nights I suppose.

Not my first choice but maybe the person in question didnt have a choice on what picture he, I am assuming it was a male, could put on the wall. I agree its a little creepy without the whole thing but maybe he just wanted to stare into her eyes while he masturbated . All in all it is an interesting photo.

Bleak is right.

Vintage smut maybe?

My quess is that the mask was used with patients who either bit, spit, or both. As cruel as it may have seemed there was probably a method to the madness (no pun intended).

I hated gym class and in particular those stupid ropes. But this is still an interesting photograph.