New theory proposes Leonardo da Vinci or collaborator created the "Naked Mona Lisa"

A new theory suggests Leonardo da Vinci or a close collaborator created the "Naked Mona Lisa" around 1515 for Giuliano de' Medici. The charcoal drawing, "Monna Lisa Vanna," shares striking similarities with the Louvre's Mona Lisa, including pose and expression. Historical accounts may refer to this nude version, not the famous portrait. Debate over the drawing's origin dates back to the late 1800s, with recent scientific analysis suggesting possible limited direct input from Leonardo.