Learning Planet Design in 24 Hours

After a long time playing with all those images of planets from the web, I designed 14 new planets for using in the game. Many still need changes or touching up here and there. It was hard at first to understand what style I wanted and what would work well with the rest of the game. I think I downloaded all of NASA's available images of planets, asteroids and other celestial objects. Some of the planets are double-layered, so the SpaceMan and the Rocketship are shown behind the clouds, orbiting rocks or the rings of a planet. Here are some of them:

  

Grabbed from an old version on my iPad, for reference: