He is known for his fine engravings of natural history subjects, especially those illustrating books by John Walcott and the Welsh naturalist Thomas Pennant.
[1] His landscape and natural history engravings are considered extremely crisp and neat.
[3] Mazell often worked on natural history illustrations for books by Thomas Pennant, using paintings of birds by Peter Paillou in The British Zoology (1766), History of Quadrupeds (1781) and Arctic Zoology (1784–1785).
[5] As well as works by Pennant, Mazell illustrated books by John Boydell in 1763; Charles Cordiner's Remarkable Ruins and Romantic Prospects of North Britain in 1792; and Captain James Cook's Voyages.
[3] Mazell's engravings are of paintings by many artists[6] including Charles Cordiner; Moses Griffiths; John Webber; Rowland Omer; Philip Thicknesse; the natural history artist Desmoulins; Samuel Rawle; Richard Holland; William Miller; Jonathan Fisher; Thomas Snagg; James "Athenian" Stuart; Christian Georg Schütz; Paul Sandby; John Watts; the equestrian painter George Stubbs.