British portrait painter Joshua Reynolds on Wikipedia.
More of his paintings after the cut.
Edit: Updated this post with new paintings and better quality pictures.
Lady Frances Finch, 1781-82.
Frances, Countess of Lincoln, ca 1781-82.
Miss Cocks and Her Niece, 1789.
Miss Keppel, afterwards Mrs Thomas Meyrick, 1782.
Mrs. Charles James Fox, 1784-89.
Lady Elizabeth Seymour-Conway, 1781.
Lavinia Spencer (Lavinia Bingham), 1781-82.
Miss Gideon, 1786.
George Grenville, Earl temple; Mary, Countess temple; and their son Richard.
Lady Skipwith, 1787.
Lady Taylor, ca 1780.
Lady Worsley, 1776.
Maria Anne Fitzherbert, 1786-88.
Georgiana, Duchess of Devonshire, 1780.
Georgiana, Duchess of Devonshire, 1775-76.
Lady Caroline Price, 1787.
The following are copies or engravings after Reynolds:
Lady Lade, 1785.
Countess Spencer, Lord Althorpe.