Why was it was necessary to display a scenario that never occurred in the actual book (interestingly enough the group was never menaced by tentacles at all), sexualize it, and then label it as a 'deathtrap' on the cover? I mean aside from obvious pandering to a certain audience? If it was simply meant to imply danger, with no element of sexuality, then what was with Colleen's top being unzipped to her navel? Why were the female characters front and center? Why did all the girls look terrified rather than displaying various expressions (such as anger?) that would suggest these were superheroes in danger, rather than helpless victims? Is there something especially dangerous about clear translucent slime dripping down Felicia's chest?
I don't know why you're emphasizing that it was a female artist. Women are not immune from producing sexist or objectifying artwork.
I see no evidence that contradicts the fact that it was a really problematic cover for a variety of reasons, so I don't see why I should admit that I was wrong.
I still think it's kind of bizarre that you think misplaced feminist rage killed the book (rather than the more obvious consistently low sales). Out of all the times feminists have raged about one thing or another THIS is the time editorial listens? Really? I liked the book too, but I'm not going to blame people for criticizing a cover that was in bad taste for the title's demise.