Elbow getting the covers is pretty easy and straight forward.
Pick first the site; You can go to msnmusic, allmusic or visit some of the label company web site...
Then surch the best resolution :. Once satisfied copy the image and paste it using the paste button under the cover menu of properties.Voila Monsieur ;D .
In some instances, as I found out, some covers can not be imported for obvious copyright reasons :'(. Do not be discouraged. Keep searching, do some digging and you will find what you are looking for.
Hope this will help. Bonne Chance friend 8)