Da Vinci- Painted the Mona Lisa, one of the most famous pieces of artwork of all time. You could also research the various inventions he designed and his work as a scientist (like his experiments in anatomy).
Michelangelo- Most well-known for painting the ceiling of the Sistine Chapel, and his various sculptures.
Andy Warhol became famous for incorporating daily *objects* into his works.
Explanation:
Andy Warhol was a magazine, and ad illustrator of the 1960s Pop art movements. Pop art takes symbols from refined art and mixes them with common objects.