i can see your idea but as posted it's not working for me. i feel the tree blends with the background rock too much. Some how you need to get a separation of the two and that may be possible by adjust colour channels in the original colour file.
Just a thought to explore: the hard shadows seem to be adding "clutter" to image so maybe a photo taken when there is less sunshine may help.
there may also be a photo to be taken of the shadows only