I think it looks great as well. I do have a couple of feedback items for you. 1. I think I liked it better with the walls for the underground rooms. It's just a thought but they seem a little "regular" and it's kind of hard to discern that they are underground. You could try to deepen the shadows or maybe use an overlay of some sort of texture on a very low opacity to show the "ground" above. 2. are rooms 4 and 7 connected? If not cool but if they are there's no obvious entry. The bottom line with this (or any project) is that YOU like it and are happy with your work. I know I'd be happy if I had made this.