Lucian Freud, whose stark and revealing paintings of friends and intimates, splayed nude in his studio, recast the art of portraiture and offered a new approach to figurative art, died on Wednesday night at his home in London. He was 88.

He died following a brief illness, said William Acquavella of Acquavella Galleries, Mr. Freud’s dealer.

Mr. Freud, a grandson of Sigmund Freud and a brother of the British television personality Clement Freud, was already an important figure in the small London art world when, in the immediate postwar years, he embarked on a series of portraits that established him as a potent new voice in figurative art.

In paintings like “Girl With Roses” (1947-48) and “Girl With a White Dog” (1951-52), he put the pictorial language of traditional European painting in the service of an anti-romantic, confrontational style of portraiture that stripped bare the sitter’s social facade. Ordinary people — many of them his friends — stared wide-eyed from the canvas, vulnerable to the artist’s ruthless inspection.