As a huge exhibition of Dora Maar's work opens at Tate Modern, we take a tour of the show with the curator, Emma Lewis. Finally, Maar is escaping the shadow of her lover between 1936 and 1945, Pablo Picasso. We also talk to Jann Haworth, the US-born artist who was a key figure in the 1960s pop art scene in Swinging London and was, with Peter Blake and Michael Cooper, the creator of the cover for The Beatles' Sgt Pepper album—though she is often ignored when that seminal image is discussed. Haworth has a retrospective show at the Pallant House Gallery in Chichester, UK.