feel free to speculate.
most of nudes usually "edited" to be perfect, so there'll be a trace of editing like unusual smoothness or another type of edit.
fakes usually nudifying pictures that originally isn't nude. know the differences.
Blacqkl did a nude photoshoot, and i post her in her thread knowing what her aliases used to be.
if by any means what i post in here is wrong, feel free to ask mod to move or delete my post.