NEW YORK (AP).- One of Richard Avedon’s most defining photographs is of a willowy model adorned in a Dior evening gown, a silk sash cascading down her slender leg, striking a dramatic pose against a row of circus elephants. It is signature Avedon. Dramatic but playful, an image shot on a hot summer day in 1955 at the Cirque d’Hiver in Paris. An exhibition-size print of the famous picture, “Dovima with elephants,” will be sold this fall in Paris, together with more than 60 other photographs, Christie’s auction house said Friday. It is estimated to sell for $500,000 to $700,000 (euro 400,000 to 600,000). The total Avedon collection is expected to bring $3.7 million to $6 million (euro 3 million to 5 million). New York-based Avedon Foundation, the largest repository of Avedon works, is for the first time selling photographs from its archive to establish an endowment to promote