Yeah, the green is getting to me, too. It looks a little better when it's cropped to the screen size, but in a full view of the map it's overwhelming me. I want to add some colorful flower patches, and break up the green/brown with some gray stones. Maybe even go over some of the tree leaves in a slightly different shade for some more variation (but the colors of everything change based on the season, so I can't overdo it).
The unique tree thing was a lack of foresight on my part. I drew 6 trees, made them into a brush... it works really nicely, but I'm going to have to go back and remake it with silhouettes instead of outlines for the next maps (all my shading and coloring is done via gradient maps, so filling in with black is a required first step anyway). And yeah, considering how many there are, no one would notice that they're all "unique". It took 2-3 hours just to go and fill all of them in :/
After talking with a friend about it I might have to move the river down a little further to fix the optical dissonance with the elevation stuff I was having trouble with. This is part of the reason why I always hated the top-down view, but when working with perspectiveless 2d, the brain usually associates down=south=lower elevation. But when I visualize things in my head, I think in 3d (so in my imagination, the right side of the map looks like
this. but that is a world that only exists in my head.) Other similar problem is how in 2d all buildings have to face the same direction. It makes interesting design a real challenge.