If you're even moderately familiar with the history of D&D Module B3: Palace of the Silver Princess, then you're no doubt aware of the two versions of the module, and the questionable artwork from the first version.
While doing some digging/scouring yesterday for some public domain artwork, I came across the following Arthur Rackham illustration from the 1922/27 edition of Macmillan's English Fairy Tales. It's an illustration of the three-headed giant from the story Jack the Giant Killer and when I saw it, the first thing that popped in my head was Erol Otus's illustration of the ubues from B3.
Was Erol influenced by the Rackham illustration? Probably. But if I actually make it out the North Texas RPG Con this year, I'm going to ask him for myself!