Very cool battle scenes - I agree with CHEWIE that some backgrounds would make it even better. A quick way that I found to make some reasonably
decent "ground" for your troops to stand on would be to download a "grass" or "dirt" background from Google images and then increase it in size a lot. Print out 3 or 4 of them (since they're backgrounds, they should match up when you tile them), and you have some instant grass. Simple and effective.
For actual backgrounds, I downloaded a forest scene (again, from Google Images) and increased it's size so that it took 8 or so pages to print out. Then I taped all of the pages together to make 1 solid image and it looked like a very decent background, in my opinion. Just make sure you don't make my careless mistake of using "shiny" scotch tape