As a longtime Apple Music user with years of experience curating large libraries, I've seen how custom album art can dramatically enhance iTunes' visual appeal. While iTunes has improved, simple tweaks like this make it even better. For more tips, check out How to Make iTunes Usable Again in 7 Simple Steps.
Purchased tracks often include artwork, but imported files or outdated covers may need manual updates. iTunes can auto-fetch art by right-clicking an album and selecting Get Album Artwork. For custom images, here's the reliable method:

