License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Stefano della Bella. Two infants standing in the water at center with their legs as scrollwork, below three small sketches of heads, plate 3 from "Friezes, foliage, and grotesques" (Frises, feuillages et grotesques), ca. 1638–43. The Metropolitan Museum of Art.