The front cover art is by Jim Roslof, who passed away last year. From his obituary at Wizards of the Coast,
As an illustrator in the late 1970s and early ’80s, Roslof had a major influence on the developing visual style of the Dungeons & Dragons game. His cover illustration for adventure B2, The Keep on the Borderlands, is one of the most iconic and widely-recognized D&D images from that period.
As art director, Roslof’s guiding hand was less apparent to players, but his influence was even more profound and far-reaching. It was Roslof who hired and shaped TSR’s famous “pit” of color illustrators: Jeff Easley, Larry Elmore, Jim Holloway, Keith Parkinson, Tim Truman, and Clyde Caldwell. Under Roslof’s direction, their paintings defined Dungeons & Dragons for a generation of players and DMs.
The back cover is by Jeff Dee, who did the front cover of the first Isle of Dread module, among other classics.
Grognardia reviews The Ghost Tower of Inverness (killer title, yes?) here. The module is currently available for download at dndclassics.com.
2 Warps to Neptune 