What makes a good album really? If it's interesting to look at? If it "fits" with the music?
Pic related, One of My favourites
you forgot the most important word for your thread my man. For me an album cover has to do both, as well as be instantly recognisable for it to be top tier. Loveless, ITAOTS, Soul Mining, Good, Bummed, Skylarking and Rain Dogs are some of my favourites