Great work, you asked for tips - cover up the bases on the figures where possible, with desert dios this is a bit easier, I use a brush to dust the sand around the bases until covered being careful to keep the boots visible . With the more solid surfaces it becomes more problematic, I try to use camera angles, debris, putting figures behind low walls, bushes and vechicles and stand them in long grass and etc, use your imagination as to what you can do, hope this is some help. But your effort is very good, well done.
Cheers,
Wayne.