When will you get Album Artwork automatically?When you purchase the entire album from the iTunes music store, you will realize that a picture, the CD cover, is added to each of the songs as well.
Another instant when you get album artworks automatically is when you subscribe to podcasts on iTunes' podcast directory. Usually a podcast's album artwork is just the podcast's logo.
How to add Album Artwork manually?If you rip your own collection of CDs into iTunes, something all of us do, you have to find and add the album artwork yourself.
Adding a picture to a piece of music is easy. First make sure the album artwork window is set to display the "selected songs". Then, select a song in your library. Now if you have the CD cover scanned into a file, or you are able to find the CD cover from some website, you just need to drag and drop the file or the picture to the album artwork window.
Drag and drop a picture to the album artwork window.
Album artwork is added successfully.
To add the same picture to a number of songs, e.g. all the songs of a single album, you can multiple-select the songs and repeat the same steps as mentioned.