I think whitewashing must have varied greatly. That said, I think you've got a good look there. One thing struck me. Since the whitewash seems fairly worn, it seems the gun would have been fired, and there is no wear on the white I can see around the flash suppressor at end of the barrel.

I see the MG barrel has been painted, I don't think the crew would have painted it. I also notice that the sprockets on the drive wheels still have their paint. The paint would have been worn away exposing the bare metal.

Really like the way you faded the whitewash around the decals and how they blend in.

My first impression was “Brilliant”, your overall technique is superb & convincing & I’ve seen very few examples better than this. Others have made fair comments about making it even better, & I’d certainly agree you should add lots of mud/slush to tone down the over-bright tracks & too-white wheels. Also the tow cables stand out too much, I’d suggest a light dirty/rusty wash over them first & maybe some fragmentary whitewash on top of that. And if the point of camouflage is to blend into the background surroundings it defies logic to omit anything – so yes even the tools.

Bravo Nigel