text: © Licensed to London News Pictures. 28/01/2016. London, UK. Detail of "Joseph Beuys" by Glenn Brown (est. £0.6-0.8m), on display at Sotheby's preview of its upcoming Impressionist, Modern & Surrealist art sale on 3 February featuring works by some of the most important artists of the 20th century. The combined total of the evening sale is expected to exceed £100m. Photo credit : Stephen Chung/LNP