Well, you really pulled it off.
To be honest, I don't even think I can take credit for this. If you were to upload the lines I gave you, I don't think anyone would even recognize them as the same that got turned into this. You've added some brilliant details.
If anything, I would say the rib cage on the gun/arm side might be protruding a little much. Maybe flatten that out a bit twoukd give him a little sleeker appearance.