I think C4D is very easy, all you have to do is create multiple spheres (each layer equals one sphere) and then you create textures that are self-explanatory. Anyway, that planet looks hawt, even without 3D software .
The color scheme is realistic but not artistic or scifi.
For a very realistic planet, it must also have a realistic glow. If you study the many images of earth by Hubble Telescope, it hardly has a glow, and if it does, a very thin faint one. For the planet to have a big glow like that, there must be alot of light reflecting from the atmosphere which would (in realistic terms) brighten the planet soo much that the texture wouldn't be visible.
Other than that, the shadow of the planet is a tad bit too light. Now, I'm going to ask you to spoil something: is the light source really bright or dim? If it's bright, the shadow should be sharper/darker, but if dimmer/lighter, the shadow should be very transitional like you have atm.
Well I generally make the atmosphere big or not depending more on my mood. I actually got some complaints for a while because my planets didn't have outer glows This is still a work in progress, so by the end it might not be the way it is here, this is just what I have so far. I will take your comment into account though, especially about the light/dark contrast but its hard to sacrifice showing off a great texture