Dropped into Tate Modern recently for my annual Jackson Pollock fix but, surprise, surprise, no Pollock to be found. And no Rothko or Lee Krasner. What’s going on? However, Tate now has this gorgeous (on loan) early Picasso, Nude Green Leaves and Bust, inspired by his secret relationship with Marie-Therese Walter. A genuine tour de force and worth the trek to the Tate even if Pollock is in storage. Look out also for a superb Joan Mitchell and Sidney Nolan.