in regards to my first post can you have album and individual track artwork ?
You sure can.
If you embed artwork into the file, just select the files and go into the tag editor,
select the Artwork tab
locate the artwork you want to use
select 'embed the picture'
select the picture type and add a comment if you want to eg. Leaflet - page 1
select if it's the primary picture to be displayed
If you link your artwork, do the same but place all the artwork into the album folder before you start and use the "link to the original picture file" option.
I've found it's best to work in reverse order of artwork importance; i.e. start with track level artwork, then album, then boxset.
Sometimes (very occasionaly) if you go the other way, MB will wipe the lower-level artwork if you save the artwork in the other order.