Now you got me thinking... The paintings do change along with the yellow note with the names after you clean/get the red key in a room. It also seems to give us a clue that the kids in the paintings are in fact the clowns, or each room just represents whoever the red arm (in the paintings(My guess is the painting clown)) victims are and however they "give" you the red key, is how they died and at the end, you yourself gets in a painting, that last one doesn't have concrete evidence... Anyone want to add on?