The cover illustrations for the Dan Simmons novels "Hyperion", "The Fall of Hyperion" and "Endymion" all feature depictions of the Shrike with two arms:
However, already in the first novel "Hyperion" it is mentioned dozens of times that the Shrike has FOUR arms.
Only the last cover in the tetralogy, "The Rise of Endymion", gets it right:
Is there a backstory to this? Clearly the illustrator was familiar with the contents of the novels, as the cover paintings depict actual scenes from the story in detail. Did Simmons add the "four arms" attribute as an afterthought? Why was this type of depiction kept for two more novels (by which time surely the author must have noticed that the text and cover art do not match) and then suddenly changed?