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 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.
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.