"Ozias Humphry (or Humphrey) RA (8 September 1742 – 9 March 1810) was a leading English painter of portrait miniatures, later oils and pastels, of the ...
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18th century. He was elected to the Royal Academy in 1791, and in 1792 he was appointed Portrait Painter in Crayons to the King (i.e. pastels)." - (en.wikipedia.org 12.08.2021)