I bet that perspective angle on the rifle was a pain the ass.
That being said, The blending that's going on along the edges of noble and the background is well done. It does a good job of emphasizing the idea of camouflage and the hidden sniper. However, since the image is so very grey on grey, there isn't really and pop to it. The visor and scope just aren't enough to offer a contrast and, if anything, seem to disrupt the flow of the image.
There's also some negative space between the chin of the helmet and the actual collar of the chest. It's hard to tell if you tried to imply there was a neck or cloth there because the white shadowing obscures it.
Overall I like it, some minor issues but nothing that seriously takes away from the enjoyment
Thank you very much for the feedback on it. I agree with your comments/really appreciate the critique. At some point, I'm going to go back to and try to make a few more changes to give it a more dynamic look.