Jean-Étienne Liotard, The Chocolate Girl, 1744-45, pastel on parchment, 82.5 x 52.5 cm, Gemäldegalerie Alte Meister, Dresden. Source

Jean-Étienne Liotard was a Swiss-French painter specialising in portraits and figurative scenes. This is one of his most famous works and was created using pastels on parchment. Liotard will be the subject of a major exhibition at the Royal Academy this autumn.