I came across a treasure trove of images the other day....the Life image archives hosted by Google. Warning, it is really interesting, you can search for anything. I just wrote artist into the box and these are just a smidgeon of what's available.What is really cool is that once you click on a picture, there are small thumbnail pics under "related images" and you can see more pictures from the roll of film that had been shot. Here are some amazing extras of Marilyn Munroe, (click on the related images to see)
The picture above is Artist Pablo Picasso creating light drawing in Vallauris, France 1949, Photographer was Gjon Mili
Andy Warhol with his Barbie Doll, 1986, no photographer listed.