What's up with the image's compression? It looks overcompresssed?
Anyhow, this is a very nice tree and scene. As far as I know the tree is from Klas Krusen and is called "The Tree".
I think the lighting is very nice in this image. Good atmo and nice stones as well.
You might consider rendering this image with more cloud and atmo samples to give it a cleaner and more crisp look.
Martin