Cooper succeeded Alexander Cuzens as Drawing Master at Eton College and taught members of the Royal Family.
The British Museum, however, has over ninety objects attributed to him including ten drawings and seventy four prints.
He drew with a reed pen, which he used with rapid and flowing movements to produce strongly contrasted areas of light and shade.
The washes were diluted and applied over the iron gall pen work, causing the ink lines underneath to "bleed".
His subjects include Edward Kynaston, Sir Robert Naunton, John Lilburne, Mary Frith and Daniel Dancer.