Houbraken relates several instances of his remarkable facility of hand. He frequently painted a large landscape and inserted all the figures in a single day—feats so much admired in Salvator Rosa, and Gaspar Ponssin. On one occasion he commenced and finished three portraits, on canvass, of three-quarters size, with heads as large as life, from sun-rise to sun-set, on a summer's day. Lanzi warns all artists, especially the youthful aspirant, not to imitate such expedition, as they value their reputation.