if you only get to use one notecard, I would say just the source information but if you get more than one then do one or two facts or thoughts per notecard:3
Theme & Variation. Why need to explain when the explanation is in the question...?
The oldest works of art that we will consider are the cave paintings found in Chauvet Cave in southeastern France. These paintings, discovered in 1994, date from c. 30,000 bce and thus are placed in the Old Stone Age (Upper Paleolithic Period)
The answer is his friendship with Claude Monet.
Hope this helped <3