not bad, it looks very playable. the architecture (room shapes and dimensions)(unless it's a circle, then i understand) is a little out of whack, but you will improve over time.
i noticed you have demons, warlocks, behemoths, dragon lords and fire elementals all in the same area, perhaps you could focus on a single monster per room/area. then decorate the room/area with the theme of that monster. i think if you did it this way, you would have more to showoff and it would give in-game players a sense of what they're about to encounter.
a solid 8/10 from me.