This was a fun exercise for a quick and dirty planet using only procedural materials and simple geometry then rendering out of Eevee. I've submitted my tutorial image, plus an exercise submission for funsies. The Omicron Persei 8 image was done in Cycles.
Great results man. The only little nit picky thing I have is that the text of Omicron Persei 8 is very big compared to the real state of the whole image. I think if you put that title much smaller it will look fancier. 🤟🏼
Y'know I couldn't put my finger on it, but I bet you're right. Thanks!