[mb-users] Label images

I look through the list of cover art types,
http://musicbrainz.org/doc/Cover_Art/Types , and am surprised there
isn't one for just the label.

When I see illustrated lists of 78s normally pictures of just the
labels are used, like at

http://78rpmrecord.com/labelview.cfm
http://ellingtonweb.ca/Hostedpages/DoojiCollection/DoojiCollection-1939-40.html
http://www.45worlds.com/78rpm/artist/ella-fitzgerald

to take a few random examples. That's what I would prefer as the main
image for a vinyl release that doesn't have a cover image. The closest
thing is "Medium" which is described as

> The medium contains the audio recording, for a compact disc release it is the > compact disc itself, similarly for a vinyl release it is the vinyl disc itself, etc.

That's good for cds, but for most vinyl releases most of the image is
uninteresting and it makes it harder to see the interesting part.