thumb maps a bit funny a, bring the bottom section of it up a bit and extend that crease/bend line a bit. assuming youre not going to do it for these textures, but for future reference. mapping is important mang.
and the contrast could probably be a bit stronger, hands generally need to be a bit harder, its a bit difficult to pick up whats going on with the more subtle stuff.
colours and contrast differ quite drastically to the head.
also, hate that footprint, hate hate hate.
otherwise i really like them, the drawing work is great and the dirty spots were a really nice touch