How To Get Album Artwork To Show

I have an old laptop with ubuntu 13.10 and a sandisk sansa zip clip mp3 player. I am using Banshee to sync music to my mp3 player but when I sync my music not all of the songs album artwork shows. I have tried everything I can think of. I have taken the album art work and lowered it's resolution to 96x96 since I think this is the right resolution. I have also tried looking at the music files on my sansa zip clip and added added the album artwork to the files there and still not all the art work is showing on the player. Any suggestions.