If that was leo's model, either he was a lonely man or she was cheap.
The arms seem out of proportion to me. Looking at the Mona Lisa and this one side by side, would help a bit.
There.


I'm no art expert but there doesn't seem much resemblance to me. The model for the original Mona Lisa was apparently Lisa del Giocondo, a member of the Gherardini family of Florence and Tuscany and the wife of wealthy Florentine silk merchant Francesco del Giocondo. The painting was commissioned for their new home and to celebrate the birth of their second son, Andrea. They never actually got it as it took da Vinci 16 years to finish it.