Your concept and contrast is very cool! The way you capture the viewer eye in his face first and then to the rest of the artwork is a huge accomplishment as well. Your color choices are spot on, the armor has the right shades for the contrast to the light behind him, and the guys in the distance are show with the atmospheric contrast with the lighter tints from what is in front of them. The only thing I notice is maybe a little more drama in his facial features sense this is the first think the viewer sees. Maybe enhance more of the male aspect of him or add a male skin texture. Other than that, GREAT job! This is a fantastic action shot! Hope this helps!