Hello!
None of this is my art, just so we are clear.
However, it is art that I have considered using as reference to when I do make my own art of the Dungeon, and are thus quite close to what I have in my head, with a bit more fantasy elements mixed in like flying creatures and lizardmen and other stuff like that.
Combined with the difficulty (and reader frustration) of describing the environments in my story, I decided to compile some great artwork from talented artists to simply give you a better mental image. At least until I'm good enough to make such masterpieces. :)