Happy to share all of the different images you'll be able to learn to create in my "Planets & Stars" course made with Learn Squared! In this course I share all my techniques, methods and thought process behind creating any type of celestial object you could imagine. I'll be showing you how to create things only using Photoshop with 2D techniques, how to create things only using Blender and 3D, and how to mix the both. I'm using Octane as my primary render engine, which also has a free version for Blender if you want to follow along. Otherwise cycles can do most things I show too.
Super fun to be sharing all of these techniques that I've learnt over the years! The course in packed with over 35 hours of techniques!
You can get the course at Learn Squared
https://www.learnsquared.com/courses/planets-and-stars