Artist worked in groups back then called ateliers (sp?) One experienced painter or teacher and his students. Maybe a student did this new one at the same time that Davince did his because the model is wearing the same dress. Whatever...... we will never know.... I like the new one better anyway.
One of the big disappointments in my life was finally getting to Paris to see the Mona Lisa and being disappointed because it is small and gloomy and ugly.
You paint things over and over???...
Davinci was an impatient "sketcher"...with only a few paintings to his name.