Hi Ryan, I agree that the rock formations are "da bomb", well done!
It looks the image has undergone some photoshopping for colors and levels, right? Actually it looks like one of the
paint.net filters (forgot its name).
Martin, I think Ryan hasn't used "receive shadows from surface", so the glowing atmosphere lights up the rock texture in some parts (close to the sun) more than it does further away from it.
Regards,
Frank