That is very interesting, and full of potential.
Your tree trunk is beautifully drawn, in an abstract structure, like nature is.
I would prefer it with brightness values (dark and light areas) instead of outlines (contour).
As for the leaves, they are cute, but I would make some of them overlap each other. Meaning, one leaf covers part of another.
I like it. For a strange reason I love the land. As I was saying, lots of potential. Good work.