Here is a recent addition I did for the Net Devil game Jumpgate. This is the first and biggest art update to the game in many years and there is lots more to come.
For the planet its very simple geometry, just two spheres and circular plane. 3 1024x1024 diffuse and opacity maps. Took some time to get it into he game though, since this was the first really new model anyone had tried to put in the game in years. The main problems were getting the mesh(s) to orient correctly around the axis, and for some reason we couldn't get the ring texture to show up. After making up some work arounds we were able to get it in to the game and patched to the live servers.