A great idea. Nicely composed too, although the subject looks just a little cross-eyed. Probably because he's looking at the crack in the mirror rather than at (or, even better, behind) the camera's reflection.
Effective lighting on the face, too.
Did you think about asking your subject to hold off shaving for the shot? It might've enhanced the broody effect. And men usually see a bit of stubble when they look at themselves in the mirror in the morning...
Nice, but I think I would have liked it better if just the glass was in focus and he was totally out of focus or the exact other way around, "half & half" like it is now isn“t really working for me. 4 from me this time but I like your thinking with this shot and I suggest you keep at this, you are on to something.