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.
Mona Lisa replicas and reinterpretations
A student and companion of Leonardo da Vinci known as Salaì painted one of the nude interpretations of "Mona Lisa" known, titled "Mona Vanna".
Salai's version is thought by some to have been "based on" the nude sometimes attributed to Leonardo, which is considered a lost work. Discussion among experts exists as to whether Salai, known to have modeled for Leonardo, may in fact have been the sitter represented in the original "Mona Lisa".