Well, I'm don't want to be rude but I'd say that there is a lot places where you can imporve alot.
Pic 1.
No tile varitation and the green stuff on bottom of screen looks waaay too blurry to be shown that close. And doodad placement is bit random there imo.
Pic 2.
Again, no tile varitation and too random placement for vegetation. And lack of height varitation. Pic is just bit too empty and plain for my taste.
Pic 3.
METAL!!! Gotta say that the idea is good but floor is just one big mess there :/ and blue fire model looks pretty plain too.
Pic 4.
Sun is ok but the lighting could still be better and tile varitation would be pretty nice and some doodads too, but this is again only my opinion.
Pic 5.
Idea is good and execution is pretty good. Best terrain of yours. Blizzard wolf model looks plain but can't help it
Pic 6.
Too much spammed trees and light ray effect doesn't look good actually.
I'd love to see some varitation there. Idea is again pretty cool.
Pic 7.
This is pretty nice too. Can't really say anything bad about it but it could use bit better lighting.
Well, that's it. That's what I think about these terrains. These are only my opinons and I hope I wasn't too harsh.
Keep it up!