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Well do you plan on leaving the sky that white? I get a great sense of depth with the way you faded the tree into the atmosphere, but it looks conflictingly unnatural against that light sky. I would go ahead and make the sky whatever shade you want and then see how it's looking, as I feel like that change will very much affect the mood of the whole drawing.
not sure you got your perspective right on that tree, if you wanted to be looking up into a tree your going to have to change you perspective, as of right now it looks like its falling over. are these houses going to be for super short people? if not you might want to rethink how big your making your detail like the flowers. as said before a sky would make this more believable. you have a good thing going with the textures and concept be a bit more careful with the detail and perspective.