Gumroad Fantasy Environment Interiors By Tyler Edlin
This tutorial covers the scene creation for 2 fantasy/ medieval environments, a tavern and wizards study. They both start from 3d mockups and not in thumbnails, sketches. This is more for intermediate photoshop users/ painters and does not cover any 3d aside from a few tips.
Gumroad Fantasy Environment Interiors by Tyler Edlin
Thankfully he shares a lot of his techniques on Gumroad covering mostly environments both exterior and interior. A great example is his older fantasy environment tutorial spanning a couple hours teaching how to paint 2 completely different interiors from scratch.