This is a very good reason to run.
If you did parralax for the trees and mountains, this would look amazing.
Yet the dragon just flies trought the trees.. I think the characters are too bland in this piece, the trees are more detailed than they are.
Nice animation. I like how the little guy runs between the trees, it gives a feeling of depth. The characters look a little flat to me, but it is maybe intended to be this way?
I think the dragon needs depth and shading