The subjects of the velvety black-and-white pictures are not exactly Irving Penn’s elegantly dressed, or undressed, regulars: a plump charwoman with her bucket and brush; a bespectacled seamstress draped with her measuring tape; a deep-sea diver disappearing into his monstrous helmet and suit. Skip to next paragraph J. Paul Getty Trust Irving Penn’s portrait of a charwoman, from 1950, is part of his series called “The Small Trades,” acquired by the Getty. J. Paul Getty Trust "Garcon de Cafe -- Raoul," Paris, 1950. J. Paul Getty Trust "Deep Sea Diver," New York, 1951. But Mr. Penn considered these blue-collar portraits, called “The Small Trades,” some of the most important of his long and influential career. He began taking them in the summer of 1950 for Vogue, the magazine with which he has become synonymous, and now they have finally found a home together at a museum. On Wednesday the J. Paul Getty Museum in Los Angeles announced that it had acquired the entire series, 252 full-length portraits of workers — waiters, bakers, butchers, rag-and-bone men — that it called Mr. Penn’s most extensive body of work.