Mona Lisa, Mona Lisa

A painting attributed to Leonardo da Vinci representing Mona Lisa, is displayed during a presentation in Geneva, Switzerland, today. The Mona Lisa Foundation, a non-profit organization based in Zurich, presents a painting and historical, comparative and scientific evidence, which demonstrates that there have always been two portraits of the Mona Lisa by Leonardo da Vinci, the ‘Earlier Version,’ made ten years earlier than the ‘Joconde’ that is displayed in Le Louvre in Paris, France. (AP Photo/Keystone, Yannick Bailly)

Question: Which painting by the old masters is your favorite? Why?