Right now the types available for cover art seems quite random (except for Front and Back).
According to http://musicbrainz.org/statistics/coverart Booklet and Medium types should be on top of that list just after Front and Back.
I think it would make more sense and avoid some (a lot?) of scrolling.

Proposed:
Front
Booklet
Back
Medium
(others in alphabetical order)

Also, not sure is (none) is a valid type but maybe it shouldn't be first in the list.