An undated image made available by the National Gallery in London of Leonardo da Vinci's Virgin on the Rocks before (left) and after restoration. The gallery says a restoration project for Leonardo da Vinci's "Virgin of the Rocks" has revealed new details and suggest that the painter may have painted all the picture himself, instead of with his assistants as previously thought. (AP Photo/The National Gallery)

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An undated image made available by the National Gallery in London of Leonardo da Vinci's Virgin on the Rocks before (left) and after restoration. The gallery says a restoration project for Leonardo da Vinci's "Virgin of the Rocks" has revealed new details and suggest that the painter may have painted all the picture himself, instead of with his assistants as previously thought. (AP Photo/The National Gallery)