A comprehensive scene with a lot going on. A good effort.
Some thoughts for your consideration, --the debris looks a bit contrived, ie too strategically scattered about, ---if possible, try to sink some of the weighter items into the sand a little , and maybe cluster up some of the debris a bit.
Could be the pics, but perhaps some shading on the facial flesh would give the figures a less pale look-- although if the figs are fixed to the base, its probably too late for that.
The placement of the figs, especially the assault troopers close to the Sherman looks very good--very authentic set up.
Keep us posted as you fully complete this one. Congrats.
Steve