Really nice piece! I really like the setting you chose for it, as well as the composition! The color usages is also quite spot on!
My only critique would be to try to be a little more careful with your line work. Sometimes it is really clean and other times it can get a little messy! So I would try to keep it consistent and try to form smooth curves and slops for things such as the mountains, for example!
Regardless, I can see that a lot of work was put into this piece! And I can say that I like it a lot! Great job!