I think it's very nice, would be nice as a non-first terrain aswell.
BUT to improve yourself, i'll give you critics;
The hill to the far right looks rather empty. Add doodads, and try make some height variations on the hill.
Trees are floating. When you place a tree, try CTRL + PgDn, will look alot better.
Add even more shrubbery! More rocks, some shrubs around tree, and just more.
The background is empty. Maybe add a more clear sky, or/and add alot of more trees? Looks unnatural.
Also the water in the foreground is kind of boring, don't know, maybe add a shipwreck or something?
Excuse me for the critics, I am not saying it's a bad terrain, just mentioning what you should improve