As far as the tree goes, how would you edit it? Do you think its a contrast issue?
I think it might be a conversion issue? The moss and the leaves are rendering very very light, as if you used a red filter or similar (err, I think I have the colors right, maybe I have it backwards, anyways, whatever makes the greens render very pale).
It feels almost like an IR shot, which renders foliage almost pure white normally.
Anyways, since the moss and leaves are so small and fine relative to the tree, the effect is almost like a sort of mist around the tree. On the one hand it looks sort of fairyland/magical, on the other hands.. I guess it looks unreal and strange, which is really the same thing. It's definitely an effect, and a strong one. Maybe I guess I'd like to see if with the greens rendered in darker tones -- maybe it would be stupid and boring then, dunno.
The more I look at the framing of the tree, the more I think you did it very nicely. It's really too big an object to stick entirely in the frame, I think, without losing the sense of the details which are so important here. So, you have to chop edges off, and I think you picked a good frame to throw over the tree.
So, uh, there's some rambling stuff. If you can make something of it and get an idea that you like, great!