It's looking good so far, but it's a little bit out of proportion and missing some bones. He doesn't really look undead, he looks like a priest who's wearing a skeleton bodysuit like you see on Halloween. You'd probably need to alpha out parts of the skin to make him appear hollow, or mesh edit the model to shrink up his abdomen.
Ribs: He needs some. He's got nowhere to put his nonexistent guts.
Legs: Disproportionately huge. Slim those down a bit; they're out of scale with the arms. Leg bones aren't that thicker than arm bones. | 
