sheess it is all green, my only advice in such a situation would be to model after references that are more interesting in the future, 'exists' and 'looks good' are different things :) You can get away with rather clean materials in games if the color tones are pleasing, i'd almost suggest sampling the green from the photo…
I'm glad I took a second look at this, because there's so much I missed at first glance. You've modeled in lot of detail that I never noticed. For example, the window seal with all the knocked out edges. That's a good idea, but it's got damage all over it, and nothing else in the scene has any. Those bricks sticking out of…