Lighten up your picture a little bit, at least in the top half. Without enough contrast between the GW case and the tank you loose where one starts and the other stops. From what I can see, the weather is great. THe only thing I would do is change the color of the tracks. I would use a darker, steel color - or maybe I'm seeing the rusty wash color. Basic point is that the treads are blending in too much with the body/armor panels of the tank.
Maybe a bit picky, but all I woiuld suggest at this time.
Looks good!