The grass and bush are too irregular, some refining could help.
Same for the clouds, they could be smoothened as they look quite rough.
The mountains' outline looks weird-is it snow?
Overall, I think this piece could fancy some refining. If you have no clue about how to fix this you can start a thread in the forum's WIP section.
I sure hope this helped, and don't take it wrong
I have to mention though: the character looks really good, great job on that