looks great! Since this scene is very bleak (rightly so), i think that a few more details like small crates and ammo boxes on the ground, ropes, some equipment, maybe even some rolled tissue paper to make blankets with straps around them. You get the idea, just use your imagination.
And much more mud, both on the figures and the floor of the halftrack. Some muddy bootprints on the tank would look nice too, those tankers have muddy boots now remember, so they will have left traces on everything they touch.