I would be almost tempted on overlaying some fabric on the pants, break it up a bit as pope Adam said. Really like what you did with the face, painting in those teeth really gave the orc some character, maybe add a bit more variation to the arms (looks a bit too plain, even for the style your aiming for... i think more so…
UPDATE: (finished) flats: I am calling it done, I gave it my best but now I must move on to new projects. The textures are now cleaner and optimized. Thanks a lot for the crits guys! They really helped me pushing the model further and it made the process a lot more fun. So big a thx to polycount. If you wanna take a closer…