I'd definately try and define the wrist a little bit more. Right now his forearm just kinda noodles into a hand. Makes one wonder how that proves to be very functional, yes?
oh shit Tim - thats really hot- a definate progression from the first sketches you did! Got that MR Rockstar last competition entry feel going on but that's definately not a bad thing.
Oh yeah if i were doing something that had really defined muscle i would definately do that, but thats extreme overkill for a model like this. Less really is better here imo.
I'd say the crevices in the wood are much too deep. You should try to let the flow of the ClayBuildup strokes define the crevices between them, and use a bit of DamStandard to help define them.