The Conversion of Saint Paul

Giorgio Vasari, Italian, 1511–1574 · 1554 · Pen and brown ink, brush and brown wash, with splatters of gray, green and pink paint over black chalk, squared in black chalk, on cream laid paper, with framing lines in pen and brown ink, laid down on secondary paper

From the collection of Art Institute of Chicago. Free to download, adapt and use — no permission needed.