The piece: "Margaux" The artist: Martin Usborne Where: Through Sunday at Houston Center for Photography, 1441 W. Alabama, 713-529-4755; hcponline.org Why: Like William Wegman before him, Martin Usborne seems to find dogs more interesting to photograph than people. But whereas Wegman's famous Weimaraners became his singular muses, appearing over and over again in various guises, Usborne's eyes find the humanity in all breeds. He loves all animals, in fact: He is spending this year trying to save one a day, a project that he hopes to parlay into his fifth book.