The full-length painting, also in this exhibition, was commissioned by George, Prince of Wales, in 1781. This sketch would have helped Gainsborough block out his composition. It is briskly executed - in places the paint barely covers the canvas - and, in particular, it is difficult to make out the miniature in Robinson's hand.
Nearly twenty years after the original affair, in 1797, George acquired this sketch from the estate sale of Gainsborough's nephew. He never displayed it but, equally, he never got rid of it - apparently retaining it as a memento.