You must be registered for see images
Lets start with the red one. This bubbles should be remove because I think this is unnecessary. It was distracting for me because It's "out in the field" kind of thing.
The green ones is about depth. These C4Ds inside the circle should be pushed back a little to create a nice depth.
Except for the small one on the left hand side. Wrong colored used for the circle.
The light blue is light source. I think you put the light source wrong on the left side. IMO it should be in the upper left not down since when you look at his clothing on the left arm, the light is hitting the upper side of his clothing and helmet.
You should also add smoke, fire, flying/dropping bullets and etc to make the tag more natural and realistic
None the less, it's a cool tag. Good job! =D =D =D