In the meantime, here's a couple of sketches I've done. Nothing special or significant as pertains to the story, just a couple of pictures that came to mind that I wanted to keep for future reference.
I'd gotten a new sketchbook to keep all the drawings for this project consistent (the top image). I was using Tuscan Red and a Cream Prisma for the drawings, but I don't like the way it scans in. The bottom three images were done in a separate sketchbook on Velvet Grey Strathmore, same color Prismas, and you can see how much of a difference the paper makes.
I had a few other colors that I was testing out. The Dark Brown Prisma that I used with White in the drawing below looks a lot better, I think.
Here are some other colors I was considering.