I like the atmosphere at the 8th one. I think that you still have a lot to train, but the things I can point yuou know is:
Hints:
1) When terraining forests, you are spamming too much things on the floor. Try putting more space between the trees, and not abuse grass doodads, as you do.
2) As I see you like tropical rainforests, I say that there is no grass between the trees in palm/tropical forests. Just large bushes right under the trees. but you can see the tile variation between the trees (wich is always sand, dirt or grassy dirt/sand).
3) You are skilled enough with foreground, now you should start doing some background work. I mean, some mountains that absorbs the color of the fog, and stay in the horizon, surrounding the screen. It increases the effect of distance/depth
Here is a tutorial I think that can help:
>> Link to Void's tutorial <<
Even though the tutorial is for pine forests, it will surely help you.
I hope I helped, and keep terraining!
