Like other renowned photographers who’ve seen their names become a bit too synonymous with fashion, Mario Testino, in this later stage of his career, is now creating something closer to pure art. And it’s of a distinctive Latin American kind, with all of the implied exuberance, movement, and color. His latest exhibition, “South Americana,” sees the Peruvian-born photographer making a triumphant return to his home hemisphere. The surprises begin in the first gallery at Hamiltons, where vaqueros (cattle herders on horseback) tear across the grassy plains of Colombia’s Llanos region. One twirls a lasso overhead; another canters into the distance. The second gallery at Hamiltons features sensual images of cactuses, scaled large. Self-consciousness, attitude—inevitable by-products of fame and high style—are nowhere to be found in these images. —Penelope Rowlands