I have to say, I looked at this thread 2 or 3 times and the image looked rather blah and boring to me(probably because of so much green and very little other color variation noticeable). THEN, I clicked on the thumbnail to view the full sized view and it turns out to be a very cool map!! If I would personally make any a change(ie, if this was my map), I would add a bit more noticeable color variation to the "grass" and tone done the saturation on the "base" grass color. Again, it's still a very fine map even as is though.