I decided to clear all of my artwork because I wanted better quality. I must have some sort of OCD, but anyway...So iTunes went through and searched for the new artwork but it didnt get everything. So I went through each album and right clicked on one of the songs and hit Get Album Info. But this didn't work all the time either. So I kept clicking it, and eventually the artwork came up! I don't know why it took 2, 3, 4 times of clicking get art. But it worked. And now I have most of my art! Hope it's helpful and you understood what I did. BTW: My Artwork folder only takes up 50 MB and I have over 400 full albums.