Terrain is nice but inconsistent, like Sleven said. Try to mask the flat cube sides with filler bricks.
Also, it's blatantly obvious where the baseplates are, and that most of the terrain consists of flat sections punctuated by small brick "islands." If you're trying to go for realistic, use less baseplates and more terraced brick terrain.
You also might want to finish the terrain and then build buildings on it; if you follow my tips you'll have to restructure some building foundations.
8.6/10