Possibly you knoe this fellow so you are bringing his personality (clearly a character) to the picture. But i dont know him so I end up wishing he would turn his face this way a bit, that the light wasn't so bright on his nose, that I culd see what color his eyes are, I want to say "Hey" and have him turn towards me. I wish you had said "Hey" and snapped the picture a few seconds later.
there is something about this shot I really like. The expression on the guys face, the moment you have captured so well helped by your title,I cant quite put my finger on it but its great :o)