If I may? I don't wish to be unkind, so please take this as constructive criticism. I like the paint scheme, but I think the colors are too similar. They need to have more contrast between the brown and green.
On my super bright LCD I can barely make out the difference. On my CRT I really can't see a difference other than a subtle shade difference. There seems to be a "splotchy" layer over it, for weathering. Turn this down a bit, maybe? That might make the brown/green more separate. (*wild guess, that might not work*)
EDIT: was just looking at the image you linked to, and wondered if you got your colors directly from there, or not. Might want to try a different source, as the colors look kinda bad on that image (the one linked).