Well, it looks like everyone's mentioned the one main problem- it's too close, too cropped. Also, the composition is too centered for my taste.
The exposure seems great to me. The eyes are sharp and deep. The lighting is a little harsh- see how shiny it is under the eyes? Some indirect lighting might work better in this instance. Of course it fit the challenge theme great. The comments look quite helpful to me in this instance.
Good luck in future challenges!
Bothers me a bit that you have all that forehead in the shot and manage to cut off the chin, it somehow just seems awkward, my suggestion is to keep the chin in the photo when composing like this next time.