François Boucher’s  A Female Nude Reclining on a Chaise-Longue (Graphite, red and white chalk on paper). ‘As the name implies, Marie-Louise O’Murphy (the model  above)  was of Irish extraction, albeit French birth . . . It was through Casanova that news of her  beauty reached the highest circles in France, Versailles.’ Photograph copyright National Gallery of Ireland

Among the more interesting pictures in a new exhibition at the National Gallery is a female nude by the 18th-century French painter François Bo(...)