I rather like its simplicity. The colours are beautiful and the scene magical. It would make a very nice illustration for a children's book, I think. I wouldn't describe it as "cute" at all. Nor do I think it "too simple" or of a kind that would be improved by "action". That seems out of place for an image of this kind. Action would destroy it and make it something other. Some more detail on the trees might be a good enhancement, though. I still think it is very lovely just as it is.