Isleworth Mona Lisa
According to Leonardo's early biographer Giorgio Vasari, Leonardo had started to paint "Mona Lisa" in 1503, but "left it unfinished". However, a fully finished painting of a "certain Florentine lady" surfaced again in 1517, shortly before Leonardo's death and in his private possession. The latter painting almost certainly is the one that now hangs in the Louvre. Based on this contradiction, supporters of the authenticity of the "Isleworth Mona Lisa" claim it is the unfinished "Mona Lisa", made at least partially by Leonardo, and the Louvre "Mona Lisa" a later version of it, made by Leonardo for his own use.
Speculations about Mona Lisa
One long-standing mystery of the painting is why "Mona Lisa" features very faint eyebrows and apparently does not have any eyelashes. In October 2007, Pascal Cotte, a French engineer and inventor, says he discovered with a high-definition camera that Leonardo da Vinci originally did paint eyebrows and eyelashes. Creating an ultra-high resolution close-up that magnified "Mona Lisa"s face 24 times, Cotte says he found a single brushstroke of a single hair above the left eye. "One day I say, if I can find only one hair, only one hair of the eyebrow, I will have definitively the proof that originally Leonardo da Vinci had painted eyelash and eyebrow," said Cotte. The engineer claims that other eyebrow hairs that potentially could have appeared on the painting may have faded or been inadvertently erased by a poor attempt to clean the painting. In addition, Cotte says his work uncovered proof that her hands were originally painted in a slightly different position than in the final portrait.