La Joconde nue or Monna Vanna is strikingly similar to the Mona Lisa: the position of the body and hands is nearly identical in the two works. It was long assumed that the charcoal work with white highlights was a preparatory sketch by a student for what would become one of the most enigmatic and famous portraits in the world.
Recent close analysis has revealed the work was created primarily by a left-handed artist, which da Vinci famously was. The drawing also has layers of markings made by a right-handed artist, which obscured the underlying left-handed marks until now. The work has been held at the Condé Museum, at Chantilly Chateau outside of Paris, since 1862, and was only attributed to da Vinci’s workshop in the 20th century.