Hey Trevor, pretty nice job there. I really like the paint on it. I do have a couple things, though.
First, it looks like the tank is running through some good mud. I would expect to see a bit more around the outer edge of the tracks where the wheels don't hit. I would also think that the tank would be sinking in the ground a bit more than you show. It looks like it's riding on the mud, not in it.
The other thing is that it looks like you painted over the view ports in the commander's copula.
Hope this helps.