You really captured the whole idea of what a soldier feels like after war. My Uncle's in the National Guard as a psychologist who treats traumatized soldiers, and he's told me about how guilty or how scared or how confused the soldiers can be after war. This is really fantastic. Seriously.
Aside from all the gorgeousness, i really think the purple-ish background blends away into nothingness (even with the sky,smoke and ground) and provides a reference for depth without even being noticeable, just like i believe a good background should do... it directs you immediately to the soldier dog and tank without leaving me looking for "more" into the background.