Sorry, but this need a lot of work yet, the terrain is so empty, and, for the terrain, you need to use Smooth function, for make it better, for don't look so artificial.
Try to use some custom doodads for Nexus, the Warcrafts doodads don't fit nothing, try this; Nexus Doodads; or find something better.
One more thing, since the terrain is small, don't put so many tress,, use all the terrain space for make Nexus.
My rate for now is 2/5. I know that you can do something better!
A decent terrain template! Anyway, review emerges!
The terrain as I've said is decent but it lacks many things.
To be honest, these are the only good things or points in your map that I can point out: fine tile variation and good use of special effects to add to the doodads/destructibles.
Now, for the bad points: terrain is not flat but the way the terrain grounds were raised and lowered looks really bad and seems too bulky and rough. I would suggest using the smooth tool to fix up that rough grounds, the terrain also is too empty. I would suggest place more doodads to give more details to the terrain which it actually lacks. Destructible seems enough seeing those wall of trees and etc.
For some addition, you should also add some fog into this and possibly a weather. It adds up to the terrain's quality and all.
For now, good job but sadly, 2/5 and set to Needs Fix. It still needs some work.