This is beautiful and I love the theme.
The only thing I was slightly disappointed to see is the rooms aren't keyed.
I imagine the random encounter table is supposed to cover that, but the illustrations show so many interesting features it'd be cool to know the idea behind them.
For me it's only a minor disappointment though, since I'm generally slightly excited to key a map for my own use if the image already evokes ideas. Already I'm getting some fun ideas as to how different areas got to be the way they are.
Cool stuff.