This picture had long hung in the Prado without receiving much attention. The landscape in the background had been covered with black paint at some point, and the picture was considered a much later copy of the Mona Lisa with little significance. Only recently it was noticed that the panel was made of walnut, a detail that suggests cinquecento origin. Infrared revealed the hidden background landscape, which is identical to the original in the Louvre. It has now been fully restored and is considered an early copy by one of Leonardo’s students.