Simulating a projector image?
 

Guys, I´m doing a music video where I would need to have the lead singer against a wall singing while a stop motion animation is being projected into his face. Ideally I would have an actual video projector there to project the stop motion animation into the singer´s face, but I´m having a hard time getting one. I was hoping this could be done with after effects. What concerns me is how to achieve the tridimensional effect that the projection would have on the singers´ face (the projection wouldn´t just be flat). Any tips on how to do this?