i've always been a fan of the darker dark knight, so overall he looks great to me!
his head and shoulders seem to be the most defined, but i'd want to see more detail on his abdomen. i.e. a washboard stomach.
his waist seems a bit wide for my tastes, but you might be going for the tree-trunk look. i don't mean that as a slam, that's just my impression.
keep up the good work, and lets see more!
-jon