The Prado's copy of the Mona Lisa sheds light on the original's completion date. The Louvre notes the famous work was finished in 1506, but the newly discovered background in the copy that was painted alongside the masterpiece is based on a drawing Da Vinci made in 1510-15. A more accurate completion date on the Mona Lisa can help narrow the dates on some of Da Vinci's other works.
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(Image: via The Art Newspaper)