Sorry, but it is bad. I will try to help you:
- Have you noticed that trees are floating? Use "CTRL + Page down" to make doodad go down, and "CTRL + Page up" to make it go up.
- Overall, it's too empty. Try to add more details! Add life.
- It is boring. Try to add something interesting in the terrain. Maybe Human/*insert any other race here* outpost, or waterfall, lake, magical Ancient....
- Add more tile variation. Currently you have 3 tiles and big space. Add more grass, then dirt, some rocks.......
- What is happening behind wall of the trees at the edge of the terrain? Nothing. You are making something that has to be natural in some way.
This isn't natural. Try to add more mountains or sea at the edge, or do anything that will make me think that end of the terrain isn't end of the world.
- And last: try to get UTM 3.0 (Ultimate Terraining Map)
http://www.hiveworkshop.com/forums/terrain-board-267/ultimate-terraining-map-3-0-a-45316/
That's it.