Look Familiar? If you're a grognard it should. I was trawling through the public domain books at archive.org when I found this picture by H. J. Ford in the Green Fairy Book. I recognized it immediately as the model for Dave Trampier's cloud giant:
It's cool how many features he kept, though I think Ford's tilted torso seems less static, has more character. And I'd always wondered a bit about those long canines, but it makes sense now, Ford uses them a lot to indicate non-human bugaboos: goblins, djinn, giants etc.
It's odd because I thought I'd gone through all the colored fairy books looking for art already. But I must have missed the Green book, because I don't recognize the other illustrations.