Hey cord, I did these renders about a month ago. I would have posted them here, but my internet was down... for about a month... so I forgot to post them up. I used only 3 layers for the atmosphere. As you can see, when you get closer to the planet, it is obvious that more layers in between are needed to get a decent fade efect. However, the result is still kind of cool. The water color is completely black, however, the color of the atmosphere makes it blue. So it ends up being the same color of the sky (which is kind of true to the real deal). The first layer has the cloud textures too. The other two layers are for the atmospheric fuz that you would get. If I could, I would get them a smudge closer, and maybe with about 6 more layers in between to get a better opacity fade from blue to black.