So after a long time I dare to share an image on this board.
I'm working with Terragen several years now, as an amateur and just for fun. Creating a render for me is still "trial and error" and "learning by doing". Since English is not my native language (I'm speaking german), all the more technical terms I had to "guess and google". BTW: It would be nice to have a german localization for Terragen...
Anyway, my focus is on astronomical art, creating alien landscapes as "real" as possible, with the needed scientific background.
So here is my render of a confirmed exoplanet: