This, IMO looks like a pretty...how shall I say... Noobish terrain. I think its just the grass model you used, that I really don't like, and it stops ubruptly, make it fade some from the path. Id totally prefer a different grass, but its your choice. You should also add some variation in the environment, different grass, plants, flowers, anything.
And it appears there are two suns, coming from opposite directions, and the two light rays on the right are coming at pretty noticeably different angles.
The castle looks nice, maybe some more doodads outside of it, like torches or something, but definitely more "life" humans, animals, etc...
The second one looks really bad with that fog. I would definitly suggest changing the color or just getting rid of it.
All in all, I think it could be a decent terrain with some tweaking.