Added 4 new planet images to work with. I plan to re-rework the others as well. A neat thing about these images is that they were made with a light source direction where the a light source came from the top and the bottom has been shadowed. If you want to cheat lighting you could rotate these images on planet creation so that the top of them point towards the sun. In the future this to can be removed for a shading mask that you could rotate instead.