Jim C.Hines' cover pose project where he recreates SFF covers is a great work of art:
https://www.jimchines.com/cover-posing/ He started it as a rant about how women are portrayed on many covers - it's both hilarious and thought-provoking.
And Smart Bitches Trashy Books have both cover snark (
https://smartbitchestrashybooks.com/tag/cover-snark/) and cover awe (
https://smartbitchestrashybooks.com/category/cover-awe/)