Famous portrait in the Louvre (4,4)

I believe the answer is:

mona lisa

(Other definitions for mona lisa that I've seen before include "Oil" , "Louvre painting" , "Famous painting of enigmatic woman by de Vinci" , "Fertiliser from seabirds" , "Da Vinci's famous painting of an enigmatic woman" .)

I've seen this clue in the USA Today.

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