Wow!
This is great, I really like it. I kinda expect it to start moving very slowly any moment.
I would lie, if I said I would not wish for some more definition on the branches, especially on the lower part, but it is still very captivating. Some more definition would just help to retain that feeling in the full view too.
Reminds me of gaia from greek mythology in a very mystic and enchanting interpration.
I like the colours and the transition from light to dark, but the facial expression is really the most impressive part.
Great job!