Well I agree, the background is what it is. But the rest looks good.
The folds of the clothes seem to be abit out of place at some points.
The tree seems unnatural, the branches are horizontal. The branches of a tree grow abit upwards to carry more weight.
Keep in mind where you want the viewers eye to be guided to, the tree are like staight lines that cut the page in half. With some more curvey branches and sidebranches it would feel a little more smooth in my opinion
(But thats just me, I am still learning allot myself, so...)
I love the charcater design, and the little details. Good job on the bird as well.
keep it up!