Is his right hand supposed to be angled toward the camera? The position looks a bit unnatural, I'd have thought that normally in that stance the right hand would be angled away. Not too much would need to be changed though, just put the third claw(?) along behind his arm. Though on second thought I can't tell whether or not you were aiming for it to look like that - if so then darken it a bit so it looks further away and foreshorten some.
Sorry if I'm talking crap here, just a newbie sharing her 2p lmao.