I quite like this. I think you've done a good job with the lighting and processing (is that one of those multi-LED shop lights?) and the expression works well. My only very minor nit is that I'd like to see a little more detail in his hair.
-The composition and the completely black background
-The look that he is sweating, or at least I think I see it....how cool would it be to have him drenched in sweat?!
-It's hard to tell if this look is one of fear or apprehension...I dig it
Things I don't like:
-Short list here....I'd like it a bit brighter with a touch high contrast...(this falls into the preference category)