I've been wanting to depict Phobos from that angle for a long long time...
In case you don't know, Phobos is the main moon of Mars (the other being Deimos) and rotates close to Mars (about 9,400 km from its surface - considering Mars has a diameter of 6,779 km), which means when on Phobos, you would have a majestic sight on Mars. Also, Phobos has almost no gravity, which means you could almost approach it as an asteroid, which differs a lot from approaching our Moon.
I've worked around 6 hours on this photomanipulation, made with Gimp (+ a 3D sphere mapping of Mars with Blender).All on Linux-Ubuntu.
All of my Mars art is detailed on my Da Vinci Mars Design blog : davinci-marsdesign.blogspot.fr…
I read the other comments about the shadow and think you got it about right. The light source appears to be coming from the right hand side and in front of the spacecraft so I think the shadow should fall where it does. I see what others have said about the shadows on the rocks, and the light source on them does appear to come from a different direction but it's still a good picture none the less. And Mars looks good blurred out to the extent that it is, I always think that distant objects should appear less sharp than the foreground.
Thanks for your comments.
I've been thinking about the surface color, but I haven't tried to stick to the brown/gery color because I wasn't sure of how dark it would have to be. That said, I could test an alternate version.
For the shadows, yes, that's the tricky part here. What do you suggest ? Should I move the shadow slightly up ?