Hendrick Goltzius, Young Woman Reading a Book (Portrait of Sophia Goltzius, Sister of the Artist?), Seen from Above, 1591, metalpoint (probably silverpoint) on prepared paper or parchment, Staatliche Museen zu Berlin, Kupferstichkabinett © bpk, Berlin/Kupferstichkabinett, Staatliche Museen/Jörg P. Anders/Art Resource, NY