Let Sam Cree or me know if you want on or off the art ping list.
Artists paint over images allt he time. I think the more fascinating question is between the two Virgin of the Rock paintings: one in London, one at the Louvre. Why do two similar images, and does this question relate to why he painted over the other drawing underneath.
Trust a professor to take all this too seriously.
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My theory? He had a client who saw the first work and offered him money to make a copy. Leo then said, "Sure. I got this other primed panel with nothing but a sketch on it. I'll just paint over it with a composition I already worked out, and turn a few quick ducats."
Is that a dirty diaper she is holding ?