You asked for advice elsewhere so here goes,
The tank and anti tank gun are way too close. One or the other would have engaged at least a half mile out and one would be knocked out. You could get them that close IF the tank were coming into an ambush and the PaK 47 was down a side street/alley and had a side shot.
The structure on the left...what is it supposed to be? From its foot print, it looks too small for much of anything. A single layer of bricks without supports is not architecturally sound.
The same applies to the sand bags. A single width of sand bags will easily fall over.
Unless you're depicting an engagement on a putting green, you should consider a more organic looking groundwork than wood. Even a thin layer of Celluclay will provide some natural looking earth on which you can use static grass, grass tufts, turf, fine ballast or any number of other products to produce a natural looking environment.