Art by Aoin
Left Eye: letter “S”
Right Eye: letter “L”
Arched bridge: number “72”
Method: high-definition scanned images from the Lumiere Technology in Paris, which specializes in digitizing artworks. Back in Italy, a Rome laboratory digitally excluded reflexes and other colors in the eyes in order to isolate the letters and make them stand out.
Traditional view: holds that the “Mona Lisa” is a painting of Lisa Gherardini, wife of Florentine merchant Francesco del Giocondo, and that Leonardo started painting it in 1503.
Alternative view: But Silvano Vinceti said the “S” might refer to a woman in the Sforza dynasty that ruled Milan. Leonardo spent time there between 1482-1499 and then between 1506-1507, Vinceti said, which might change the date of when the painting was begun.
Update: An Italian art historian, Silvano Vinceti, believes the model for the “Mona Lisa” was a man named Gian Giacomo Caprotti, better known as Salai, a male apprentice (and possible lover) of da Vinci.
At a press conference in Rome on Wednesday, Vinceti explained his theory. “Salai was a favorite model for Leonardo,” Vinceti said. “Leonardo certainly inserted characteristics of Salai in the last version of the ‘Mona Lisa.'” Vinceti pointed out the similarities between the noses and mouths as examples. (Source)