Oh man, this rocks. You’ve spoken right to the illustrator in me. And how you integrated your medium with the theme! I admire your creativity; you ought to be proud of this (and from your page, you said this was last-minute? That must have been a blessed minute!).
Out of curiosity, what all media did you use for this? I see pen & inkwash, obviously, but then maybe some whiteout pen on… I’m gonna guess not watercolor paper, because the grain seems too fine to me, but please correct me if I’m wrong!