That's super fucking good. The colors all go well together, and Sanke is very well drawn! neat lineart-- it actually almost looks like really nice concept art for a movie scene. Very very nice..and if it is turned into a poster, I'd love to buy it..
Here's a crit for you. Seriously great use of color, caught my eye instantly. I think you could work on communicating volume better though. Try making big decisions when painting shadows. Also, to nitpick, something seems wrong with the way his arm is positioned. I think the pose could come off as more dramatic. That's an initial sketching issue and a little late to correct. All-in-all though, it's still a favorite of mine!