National Portrait Gallery, LondonThe actor’s life in pictures, from mousey-haired teen to American icon to her shocking death at 36, beams with the charm that defined a century. But why aren’t we shown more of what lay behind the smile?

National Portrait Gallery, LondonThe actor’s life in pictures, from mousey-haired teen to American icon to her shocking death at 36, beams with the charm that defined a century. But why aren’t we shown more of what lay behind the smile?