Removing artwork

Try Right-clicking (or Control - Clicking) and then select 'Clear Downloaded Artwork' ?

 

As far as I know, this only works with automatically downloaded artwork. The artwork added manually has to be removed manually: CMD-I, select the album artwork & delete.

 

u sure u cant just paste any nother album art over the one u did wrong to make it correct?

 

Select all the tracks on that specific album (hold Shift down, select first song, then select last song). Right-click (CMD + click) anywhere on selected songs and select Get Info. From there you can select the album artwork by double clicking the artwork box. Once you click OK, it should change the artwork to the one you specified on all the tracks for that album.

 

When you do this, I'm pretty sure it just adds the new artwork to the old artwork (you can have more than one image per song).