Polychrome marble bust of Kristina by unknown Italian sculptor, at the Braunschweig Museum (now the Herzog Anton Ulrich Museum)

Source:

Bidrag till svensk regent-ikonografi, Två Kristinaporträtt i Braunschweig, by Sixten Strömbom, Personhistorisk tidskrift. v.15-16 1913-14.

https://babel.hathitrust.org/cgi/pt?id=wu.89097340509&view=1up&seq=589&q1=drottning%20kristina