Using blender as base to create cover art

Hi guys,
I’m looking for some tutorials about this process: creating a scene in blender and then refine it to get a ‘cover art book’ look.

As reference I can share this beautiful work by Sebastien Hue: https://www.artstation.com/artwork/Vg1Na8

I am really curious to know more about the whole process, can you recommend me some resources?
Thanks!