Legs
I said it on another character of yours as well, but I mean it here too. Those legs, i'd definitely mess with 'em. It seems like you spent a lot of time (time well spent) on his arms and his head, and that connection from body to head. All really really well designed. As a result though the legs feel like dunno.. normal.. I'd say find a way to incorporate that gemmed motif in the legs, or mess with the way his feet look. For a creature with such mutated arms, i'd expect him to have somewhat of the same mutation in his legs. Play with it. Cheers