There is no yellow green in the color scheme, so I coaxed the greens into more bluegreen and put dark tones of blue into the shadows. As always I eliminated detail from the photo using the plugin Topaz Labs\Topaz Simplify 3 from http://www.topazlabs.com/
MY TRICK: Both rocks and trees are done with TWO brushes. The first lays the foundation, the second polishes the product.
Here's a view of the finished product.