Where did the bullet enter room that two face shot in batman?

In the Batman film "The Dark Knight", Two-Face doesn't get shot. He gets burned by acid during a botched robbery. The acid melts half of his face, hence the name Two-Face.

It's important to distinguish between the movie and the comics. In some comic book storylines, Two-Face does get shot in the face, but it's not a primary event in the "The Dark Knight" film.