Nice work so far. What I would do is get lots more grass and flowers in to cover the bare ground. And I also think this could be a very nice setup for a moody image, with mist and some strange light here and there, really mysterious. The trees are very nice, but some of the branches just have leaves on them, and these look a bit 'simple', and that's too bad. Maybe you can obscure those branches with other foliage.
I agree; let it sit for a while and see what ideas come up.