For a compilation track, MB currently looks for a picture in the user's local folder like the following:
for a compilation track it first tries <album>--<title> and if no match then it falls back to <album>
If none of those are found, does it try a web search with the "album--title" template, or just looking for the usual artist pictures?
Would be great if none of those image files are found from the folder, it then searches the web with "album", if none then, finally, with "title", which would almost automate handling of a compilation track. Currently it's a lot of work to remap compilation albums, as there's no way to map entire tracks in an album with a preferred-format template.