JEAN-ETIENNE LIOTARD (1702-1789) Maria Frederike van Reede-Athlone at Seven Years of Age (1755) Pastel on vellum (57 x 43 cm) Paul Getty Museum To enlarge the picture, right-click on it and "Open in a new tab" Portraiture reached its most refined and sophisticated state during the 18th century. The number of artists whose chief occupation …