Nice stuff.
My biggest issue here would be the lack of markings. Since you said you redid it, I assume the markings got wiped out, right? If you're going to do a few more in ground type schemes (what kits are the other two? Gundam or GM [G] types?) I'd suggest you might want to look at a set of aftermarket decals for them. Tim at Child of Mecha does a bunch of custom Gundam decal sheets, including a nice Feddie ground type sheet
Here. The colors are good for the Sniper, but they do tend to blend everything together - maybe a little work on the edges of the armor might delineate things a bit better? There's also a few spots where the sprue attachment marks are still there (the cockpit hatch, mainly) - they could use some work.
For future camo ideas, Gundam kits often look best with sharp-edged camo patterns, due to their sheer size. The same sort of drab greens work nicely, but maybe you could look into colors with higher contrast between them? Adding in some browns could work, too.
YODA:
They're 1/100 scale. The GM Sniper in particular is 18 meters tall at the head. So it'd stand a pretty good chance of standing above the trees, depending on the forest it's in at the time.