Thats not bad.
You are exactly like me, but one year ago, lol.
Your terrain is good, but it is a bit noob. Here are some hints:
1) I noticed you know making cliffs with the raise tool, and place the rock tile on it. But there is a problem: Some hills are not all covered with the rock tile. Only a bit of them are. So, add the tile at all the hill. And don't forget to add pathing blockers at the sides, or the players will be able to walk through to mountain, and that is not cool =].
2) You added the trees on the rocks. And they don't grow on rocks!
3)Hint for those who use the default trees: Some of them, are placed too small. And thats strange. So, increase their size to 120x120x120, and it will be better.
4) Don't add many doodads at the paths. Add them near the paths, to make cleat that... "that is a path". You got the idea =]
Thats it! Keep terrainning! And see how people like Craka_J and HappyTauren terrain! It will help you a lot!