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He also engraved a great number of portraits and compositions by Dance, Jackson, William Owen (1769–1825), Stephanoff, Bonington, Sir Robert Ker Porter, and others, and was one of the artists employed by Turner on his Liber Studiorum.
Huw was sponsored by several members of the gentry of north-east Wales, including William Owen of Brogyntyn, Sir Thomas Mostyn of Gloddaeth, and Sir Thomas Myddleton of Chirk Castle.
On the appointment of a Royal Commission under William Owen to investigate the administration of the Lands Department in 1905, Willis fled to Western Australia and South Africa.