Focus on this artwork and discuss the Bronze models.
While he worked on the marble bust, Bernini also created two identical bronze casts of the bust. These are currently on display in the Musée Jacquemart-André in Paris, France, and in the Carnegie Museum of Art in Pittsburgh, Pennsylvania, USA. It is generally believed that the two bronze busts were created as replicas, but recent studies seem to show that the bronze bust in Paris was a first specimen, chiselled by Bernini, and destined for a leading Roman collector.
Pittsburgh Musée Jacquemart-André Carnegie Museum of Art