How to Change your iTunes Album Artwork

There are a few ways to do this, but this is the most reliable.

First, right-click (control-click on a Mac) on the artwork you want to use and save it to your hard drive. Then go to iTunes and select the song whose artwork you want to change. Go to the File menu and select "Get Info." Click on the Artwork tab, then click the Add button. Locate the new artwork on your hard drive. If necessary, drag it all the way to the left in the display box, and click OK. You're done!