I like the processing, very stark and the mood is expressionless, if that is what your after then you got it. Composition wise, I think he needs more room above his head. I think some more poses (but with the same processing), off center, head turned slightly, eyes looking up or down, would be interesting and might add some depth. Nice shot, excellent processing which really creates an interesting feel.
Sometimes sad/tired is a good expression.
You DID ask for a critique, right? Rick gave you one.