This link was beneficial in my art analysis.  The site has a vast amount of artwork from all kinds of artists, with great descriptions of both the art and artist.  Very helpful with my artist especially as his art sells for extremely high prices and is admired by the art community.  The site tells what the art is about and the time period, giving it some historical background.  It explains everything about the art from what it is made of, the dimensions, where its been, and where it currently is.