This is the 12th level of the pit, which has its own upper level just above the pen in the photo. There’s a lot going on here and I promise I’ll explain it, room by room, in the DM notes.
The short version of the story is that an ancient hag is living here with her derro minions and an assortment of demons, flesh golems and various other creatures and she’s trying to wake up Ghanya, the entity living at the bottom of the pit (info on that here).
Anyway, I’m gonna get back to work and get these colored. If you’ve got any thoughts or questions about any of this, let me know!