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. 

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

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

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Wasn't sure if I should put this on r/iamverysmart or r/murderedbywords, so r/Tumblr will do. : r/tumblr

Study of the Prado Museum's copy of La Gioconda - Museo Nacional del Prado