Scientists have a few more doubts...
Bruno Mottin, a conservation expert at the Louvre museum warned that “we must remain prudent” about definitively saying the sketch was made by Leonardo.
“The hatching on the top of the drawing near the head was done by a right-handed person. Leonardo drew with his left hand.”
But here's what we know definitively now.
The Jaconda Nue came from Leonardo Da Vinci’s studio during his lifetime.
“What’s new is that we have been able to narrow down a time frame and an artistic environment and we have found the quality to be very high,” Mottin said. “The creative work on this oeuvre is very close to the lower part of the Mona Lisa, the one in the Louvre.”
Whether or not Da Vinci sketched it in full remains to be seen.
As Mottin notes, “It is a very difficult drawing to work on because it is particularly fragile.”
A naked Mona Lisa, how about that!