I'm saying pullet. If its somewhere near a year old you at least see sickle feathers from that picture by now. My barred Cochin girls barring was not super dark (as compared to to a BR or Dom), and the boys were VERY light. My Cochin boys also had really large combs, which would also be visiable from this back shot. Cochins take a very long time to mature, some of my hens didn't lay until they were over a year old, and mine were hatched in Feb. Good luck.
Nikki