Even though MusicBee's internal function for finding album art is working very well, there can be reasons to use alternative methods.
Personally I am very fond of
Album Art DownloaderBut I stumbled upon a website that also seems to work very well.
It also allows for using query parameters, so I thought to put that to use and create custom weblinks for it.
Here are two weblink codes that you can paste in a
Preferences > Internet > web-link field.
The first one is set to find only higher quality images of at least 1200 px. in size.
The second one is for more obscure albums that don't get found with the first one and also allows for lower resolutions.
1.
https://covers.musichoarders.xyz/?artist=<Album Artist>&album=<Album>&resolution=1200&sources=amazonmusic,deezer,gracenote,itunes,qubuz
2.
https://covers.musichoarders.xyz/?artist=<Album Artist>&album=<Album>&resolution=500&sources=amazonmusic,deezer,discogs,gracenote,itunes,musicbrainz,qubuz,soulseek
The website that the links lead to makes it easy to find out how to tweak things to your own preferences.