This photograph is by Marie-Lan Nguyen, who has kindly released it into the public domain. It is free for your use.
Bronze copy of the original marble statue
Photo by Marie-Lan Nguyen, released into the Public Domain
The original marble statue of St. George by Donatello was sculpted in 1416, and currently resides in the Museo del Bargello. This copy is in Orsanmichele, Florence.