Very good. Great job on the dirt and rust. One minor thing, I cannot spot any chips in the paint or powder burns from small ordinance. -I had some reference pictures somewhere I'll try finding them. PM me if you would like them.
Really sharp looking, only problem I have (personal preference really) is I like blue plasma. Only other thing I could suggest is trying a little object source lighting on the plasma stuff, would really make your tank pop. Otherwise, looks amazing.