his hands are lacking, its like the body of the hand ends too soon and he doesnt have any knuckles. the part before the finger start is too thin. theyre just odd and wrong, look at your hand in the mirror in the same position and compare to the drawing and youll see what im talking about.
also, the light source seems to be inconsistent, its all good on the clothing, but when you did the highlights on his skin your light source changed to like a straight on. it looks like you went for like a luminescent kinda look, but the light would still effect him in a similar way as the clothing