Exhibition of the week Zurbarán A mind-bending, revelatory exhibition packed with extraordinary loans from the Prado and other top museums that prove this painter belongs with Goya and Picasso as a Spanish great. Read the review . National Gallery, London , 2 May to 23 August Also showing Our George Crompton Gilbert & George pay homage to their late homeless friend who appeared with them in their art and shared their life. The Gilbert & George Centre, London , 1 May to 2027 Lynn Chadwick Outdoor sculptures that teeter between abstraction and expression by this post-second world war British artist. Houghton Hall, Norfolk , 2 May to 4 October Angel Otero Thickly built up, imagistic paintings by a Puerto Rico-born artist who has had a residency at this gallery in Somerset. Hauser & Wirth Somerset , 2 May to 18 October Daiga Grantina A Latvian sculptor based in Paris reveals her enigmatic abstract art with unexpectedly lush evocations of nature.…