Just a beauty of a girl and a portrait I think, no explication required! Quite angeliic looking--but something in that face suggests to me that she was more than a handful! No message at all on reverse but addressed simply to Oval Thurston of Fountain City (Indiana) and postmarked Dec, 23, 1909 with a nice flag cancellation. (I've found some records of Oval--such a good name!--who was married in Fountain City in 1910.)
5 7/16" x 3 7/16" and in very good condition.