Painting (like poetry) chooses from universals what is most apposite. It brings together in a single imaginery being circumstances and characteristics which occur in nature in many different persons.
Source, in full
the announcement in the paper of 6. Feb. 1799 was necessary because Goya was unable to find regular bookshops to sell the Capricho-prints. That year 300 sets were printed, which meant 24.000 prints!! - without the mis-prints and proof-prints.
Notes from Wikiquote
The Caprichos was the name of a serie of eigthy prints that Goya entitled 'Los Caprichos'; Goya made them in a combination of regular etching & aquatint technique. Etching gave lines by scratching with needles in the copper-plate. Aquatint gave fields of flat watercolor wash, a uniform tone composed of tiny grains and speckles rather than lines (as Robert Hughes explains) in the same book, p. 176-177/207-208)