These modular planets, and some asteroids and suns, were for a team game design project, Stellar Decay, which you can play on itch.io. To make a lot of high-quality planets in a short amount of time for this project, I made them modularly, which you can see in one of the videos included. https://sandan315.itch.io/stellar-decay
Video of the final product of the game, Stellar Decay
Video showing the modular planet creation I set up in my drawing software