Fairly well executed, there are just some things that bug me.
For one those river rushes cattails (or how its written) look horrible, not only in your terrain, but in every terrain I see. Then there is the background, it seems like ut abruptly ends, even though there are some fancy lighting that kind of covers it, you should consider having layers of mountains in the background. Your terrain also should have a sort of center of focus, I mean, there are barely anything going on, there is these two hand-like statues, and then there is forest and a little pond lake-ish thing, you would want to add something that makes people WANT to watch your terrain, a villa, a ruin... And do forth.
And yes, those green balls doesnt look good.