Agostino Carlini; Francesco Bartolozzi; Giovanni Battista Cipriani, 1777, by John Francis Rigaud. Three Italian-born artists who made their careers in England and who were all founder-members of the Royal Academy. Carlini is shown with a sculptor's hammer, Bartolozzi with an engraver's burin, and Cipriani, sitting before the easel, has a palette and a brush in his hand. Art C 1750, John Francis, Battista Cipriani, Francesco Bartolozzi, Francis Rigaud, 18Th Century, 1777, Agostino Carlini, John The Baptist
Sir William Chambers RA (1723-1796) was a Swedish architect, based in London. Among his best known works are Somerset House, London, and the pagoda at Kew. Also the Dunmore Pineapple and Dundas House. He was a founder member of the Royal Academy.
The Countess of Sussex by Paulus Van Somer (1576/78-1622) a Flemish artist who arrived in England from Antwerp during the reign of King James I of England and became one of the leading painters of the royal court. Which countess of Suffolk this is, I don't know, could be Bridget Morison, wife of Robert Radcliffe, the 5th earl. (His mother was Elizabeth Howard, the half-sister of the Elizabeth Howard who was Anne Boleyn's mother.)
Self-portrait, c.1788 Sir Joshua Reynolds. The Preeminent British artist of his day in Georgian England. A studio replica of Reynolds's original of c.1788 in the Royal Collection (London 1986, no.149). The sitter's left arm, which in the original is raised as if in the act of painting, has been lowered. (c) Dulwich Picture Gallery
Chinese artist Tan Che Qua visited Georgian London (1769-1772) and exhibited at the Royal Academy. He is painted in Johann Zoffany's The Portraits of the Academicians of the Royal Academy, 1771-72 en.wikipedia.org/... top left hand corner (detail below) and one of his clay work models. Article: goo.gl/JVVewL