Here's the final version of one of my illustrations for "Trapped in the Tower of the Brain Thieves": the first of my illustrated, interactive stories at Thrilling Tales of the Downright Unusual ( [link]
Gwen Hopkins is taking off over Retropolis on what she thinks is an innocent errand: her uncle, Cornelius Zappencackler, has asked her to deliver a highly customized toaster to Doctor Rognvald in Iceland.
Gwen's actually happy that Uncle Cornelius isn't working on anything that's likely to crack the world wide open or extinguish the Sun. Gwen would be a lot less happy if she knew what Doctor Rognvald was planning to do with this device.
This version of the illustration is based on the one at the web site, and in the book, but has been re-rendered and overpainted in a much higher resolution even than the book's version: 300 pixels to the inch, at 18 by 24 inches.