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

Newly detailed high-resolution scans show traces of a charcoal underdrawing

Original Portrait of the Mona Lisa Found Beneath the Paint Layers of da Vinci's Masterpiece

Mona Lisa': Hidden portraits 'found underneath

Hidden Portraits Found Under 'Mona Lisa' Painting

7 mysteries of the Mona Lisa

Mona Lisa': Hidden portraits 'found underneath

High-Res Image Scan Detects Hidden Drawing Under The 'Mona Lisa

Leonardo da Vinci may have painted another 'Mona Lisa.' Now, there's a legal battle over who owns it

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The detail that unlocks the Mona Lisa

Scientist Discovers Hidden Drawing Beneath the 'Mona Lisa' –

Mona Lisa': Hidden portraits 'found underneath

Mona Lisa Painting: A Scientific Analysis on Vinci's Best Art

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

Hidden Portrait Found Under 'Mona Lisa' Painting - ABC News

Two–Mona Lisa theory - Wikipedia