Chiaroscuro (noun)
Italian word that refers to the shading (or modeling) in a work of art.
Caravaggio is well known for his highly developed chiaroscuro.
Sally Coleman | The Art Minute
Michelangelo Merisi da Caravaggio, The Conversion of Saint Paul, c. 1601, oil on canvas, 7’6” x 5’7”, Cerasi Chapel, Santa Maria del Popolo, Rome. Public domain via Wikimedia Commons.