you need to add some dirt and grime to his body because at the moment, he looks like a clean gi joe model. Also, his left hand pointer finger almost looks like a claw. Just some critiques I hope help push this image forward.
Besides the critiques from the previous post, the only thing I would like to add is that the Rock in the Foreground seems to be a bit lit up too much. Rocks in the desert don't shine that much. Clothing looks great. but the rock draws my attention to much. Good Luck.