Good detail, impact, technique, and the way you put colors together is good. It looks like something real mixed with a comic page, I'd like to see more of your stuff like this. Perhaps next time you can do a whole army with a nice battleground.
There is not much I can pick through, not that I like to pick out flaws, but art isn't perfect. This piece would look good if you digitally remastgered it more, maybe add cooler shadows and effects.
Not much I can say now, good job and keep up the good work my friend.