Background For A Game Board

HI everyone,
I am working on the background for a game board that my friend needs for school. The teacher agreed that I could “help out” with the artwork. Here’s what I’ve come up with so far (I don’t want to put to much effort into it because it’s not my project :)). Tell me what you guys think!

All poly modled, rendered with Mental Ray and the default scan line renderer.

It’s supposed to illustrate the change from wilderness, to Indians, to forts, to railroads, and then to modern day.

the pic might be a little dark, my monitor is all messed up right now.

Thanks In advance,
3dnirvana