When deciding embedded album art size, there's a compromize between art size and quality. You don't want to double the mp3 file size just tp have a great cover, when a 100kB file will do the job. the jpg compression ratio / quality setting is more important than pixel size for how much space embedded graphics add. A size+qualiry preview window option would also be great. Bliss could then both resize and remap pixel quality to save space.