Look, it is exactly as Nudl9 said.
Well, the only things you must do is:
1) The terrain is too charged, if you understand me. Much elements close one to another and the pathing is small. You can "push" the doodads a bit far one from another, until they look better. It will be better for the gameplay and for the terrain. And more shrubs are welcome!
2) The tile variation is good, but it is not that good. Well, add dark grass under the trees and rough dirt at the lake.
Thats it! Keep terraining, one day you'll get it! =]
[Edit]
I forgot to talk about the fog! Go to
Scenario>Map Options
And check the "Use Terrain Fog" box.
Then use your wanted color.
If you want to choose the density of the fog, you must change the "Z start". Smaller number, denser fog.
And the most important: With the Map Options closed, press "v" to see the game view.But you already know this lol
Thats it!