This is pretty awesome. I couldn't tell at all there was photo montage involved in this so that's a testament to how well you weave the painting and the photography. The composition is really strong and guides the eye all the way to the back. The only problem for me is the shadows seem a bit shallow in places around the foreground. Have you considered adding just tiny amounts of red to those to both pull them forward and add depth to those areas?
Thank you for the compliments and feedback, I appreciate that. I'll definately take your critic to consideration. You have an interesting point there. Are you mostly refering to the island/planet the man is standing on? Have a good day/evening!