Amazing work, I like the feel, and the idea. Here's some notes on somehow improving it, from my opinion:
-Less use of dark green. Try out more bright green.
-More content in the middle. I think it feels a bit empty in the middle, you can add birds, more mountains, or more bright sun.
-A bit more details on the character. The character is notable but somehow not looks unfinished, give the shoulder more shading for example.
Other than that, amazing work, I love the idea and the feeling it gives, it's almost alive. Keep up the good work, well done.
This one looks so calm.
It makes me feel so free and independent from everything when I look at it.
And the colors - the colors!
You chose the right ones and they fit so well together!
I bet this took you some time, it really doesn't look easy.
I just love the way you drew the bright shine.
It's so magical and no one can say what's behind there - it'll always be a mystery and I love this kind of pictures.
Unfortunately I don't see much of those.
But when I keep this all a little shorter what I said - you are very talented and made a wonderful job here!