How to Get Pictures for Songs on the iPod Touch
- 1). Plug your iPod Touch into the computer using the iPod USB cable.
- 2). Click "Start," followed by "All Programs" and "iTunes." Click the "Music" option under "Library."
- 3). Click "Edit," and then "Select All" in iTunes. Right-click and select "Get Album Artwork." Then click "Get Album Artwork" when asked if you want to get the album artwork.
- 4). Wait for iTunes to download the artwork. This may take several minutes depending on the number of albums that lack artwork.
- 5). Recopy the songs from iTunes to your iPod Touch. If your iPod Touch is automatically set to synchronize with iTunes, iTunes will automatically recopy the songs.
- 6). Disconnect your iPod Touch after iTunes has recopied the songs. Press the "Music" button on your iPod Touch and play a song to see the pictures iTunes has added.
Source...