I would make the grime not so even over the character. Have patchy parts.
What's up with the side of his belly? it looks like it's been crushed in?
There appears to be some weird stuff going on inbetween his toes too.
The whole broken eye thing doesnt really work too well IMHO. I would rather you had the two eyes i but just make them look worn rather than having one broken
Technical Director - Framestore
Currently working on: Your Highness