It's a lovely image.
I have used photos as a reference for my paintings over a twenty year period. During that time I have usually studied a photo over a 3-15 hour period while I have been painting. The lighting in your photo is very unusual, especially the highlights under the branches. I would love to know more about the lighting.
As to the rock on the right, my painting teacher has always emphasied a hot, warm, cool, cold and neutral palette, so I wouldn't mind seeing a little more of it.
It is an intriguing image, well done.
Cheers,