Artist Artwork

MusicBrainz Picard should enable you to do this at least semi-automatically.
But it is not the most intuitive software out there.
Watching an introductory video on Youtube is highly recommended.

There is also this, but it’s already missing some pictures


Depending on how your music is tagged internally, you should also be able to use mp3tag.
If you have the proper FirstName LastName in your artist meta tags, you can use this format string for mp3tag’s “Convert: Tag > Filename” feature:

E:\MP3\$if2(%albumartist%,%artist%)\$if2(%album%\,)$if2(Disc $meta(discnumber)\,)$if(%track%,$num(%track%,2). ,)%artist% - %title%

(replace the path at the beginning with a location on your computer)
I highly recommend to go album-by-album, to catch and revert any mistakes which might occur.