Fabulous! Brilliant crosshatching, particularly love your depiction of Xolotl (bonus points for that - always had an obsession with Aztec mythology, you've incorporated it well here!).
Silva was probably one of the best villains I've seen. Thinking of starting a painting of him sometime soon, thought I'd see what other artists have made of him and I have to say this is probably one of the best depictions I've seen. Great work.
Actually, the look of the character came last. He said that he talked with the writer/director-whomever-and they discussed the whole 'uncomfortable' feeling that is Silva. They told him, "Leave it up to the imagination", which he said is pretty daunting to anyone approaching a role. With that, they later came up with the look that fit with the squirmy discomfort that went with him.