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]
Nat and Gwen are approaching the Tower of Doctor Rognvald in Nat's Auburn racer. The Tower is a "Precariously Situated Research and Development Installation, Second Class, Type C" - which I think is obvious from its picture. Type C installations are always found in dangerous locations but they're not licensed for defensive (or offensive) machinery. Doctor Rognvald is a cheater.
But that's not clear yet, of course, so our heroes feel pretty comfortable about landing their rocket at what they think is a safe distance.
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.