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The only thing many of the varied photos in G Fine Art’s latest exhibit, “Portraits,” have in common is that they are precisely that. Even this fact is stretched to its limits by the work of photographer Beat Streuli, whose subjects in the series “Bruxelles” are shot in the midst of an unaware crowd by means of a telephoto lens. By definition, they’re snapshots, but Streuli captures emotion as well as any portraitist: a disaffected teenage girl, looking down, perhaps at a cell phone; the solitude of a veiled girl. Photos of teenagers stand out among the rest of the portraits, especially those of Alec Soth, whose three contributions to the show are of teen couples who live in Niagara Falls. Joe of Alicia and Joe clings tightly to the girlfriend perched in his lap; in another portrait, Tricia rests her head on Curtis’ too-skinny torso, the self-inflicted cuts on the couple’s arms uncomfortably displayed. The children in Rineke Dijkstra’s park portraits look as though they were plucked from a Diane Arbus photo, while the posed studio shots of Malian photographer Malick Sidibe simultaneously evoke family albums and anthropological photos. South African artist Zwelethu Mthethwa’s portraits of African women in their homes displays the cruel irony of a poor woman’s tablecloth made of advertisements for “Successful Living,” suspended above a dirt floor. “Portraits” is on view from 11 a.m. to 6 p.m. Tuesday through Saturday, to Saturday, March 1, at G Fine Art, 1515 14th St. NW, suite 200. Free. (202) 462-1601.