Mona Lisa Underdrawing Researchers Discover a Hidden Drawing Behind 'Mona Lisa

No, this isn’t the plot of a Nicolas Cage movie. A special camera went deep into the famous painting
A special camera went deep into the famous painting's nooks and crannies. 

A NEW WAY OF LOOKING AT THE MONA LISA, monalisa

Hidden Drawing Discovered Beneath 'Mona Lisa

PDF) Mona Lisa: A Comparative Evaluation of the Different Versions and Their Copies

Hidden Drawing Discovered Beneath 'Mona Lisa, monalisa

Leonardo da Vinci's Mona Lisa – The Artistic Adventure of Mankind

A NEW WAY OF LOOKING AT THE MONA LISA, monalisa

Mona Lisa': Hidden portraits 'found underneath

Is There a Hidden Drawing Beneath the 'Mona Lisa'?, monalisa

The Mona Lisa - The Collection - Museo Nacional del Prado, monalisa

Mona Lisa copy painted by Leonardo da Vinci's student unveiled in Madrid

The Mona Lisa - The Collection - Museo Nacional del Prado, monalisa

Mona Lisa, monalisa

How Leonardo da Vinci Made Mona Lisa Smile - The Atlantic

A NEW WAY OF LOOKING AT THE MONA LISA, monalisa