The Sunday Preview: Art:

Georgia O'Keeffe (Hayward Gallery, 071-928 3144, Thurs to 27 June). A legend of American art, famous through six decades for her abstracted canvases of flowers, bones and skulls and for her collaboration with her photographer husband Alfred Stieglitz. Plus dramatic landscape photos and light installations by James Turrell.

Lisa Milroy (Waddington Gallery, 071-437 8611, Wed to 1 May). New paintings by the winner of the John Moores Prize.