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.
Lisa del Giocondo
The "Mona Lisa" fulfilled 15th- and early 16th century requirements for portraying a woman of virtue. Lisa is portrayed as a faithful wife through gesture—her right hand rests over her left. Leonardo also presented Lisa as fashionable and successful, perhaps more well-off than she was. Her dark garments and black veil were Spanish-influenced high fashion; they are not a depiction of mourning for her first daughter, as some scholars have proposed. The portrait is strikingly large; its size is equal to that of commissions acquired by wealthier art patrons of the time. This extravagance has been explained as a sign of Francesco and Lisa's social aspiration.