iTunes and album artwork

Only if iTunes doesn't have it

You can easily find the image and paste it in iTunes

It's pretty easy to add it on your own if you want..

Save the pic to your computer, and add after clicking get info.

Or just copy the image and paste it like croacka said. I only have a handful of purchased songs on my iTunes. The others I spend a lot of time on google images looking for the correct album artwork to keep my library clean.