My husband, James Stratford's, photo of the amazing hellenistic sculture often referred to as Boy Jockey and Horse. It was discovered in a shipwreck. He posted it as an image embodying power in his post: http://beyondthecall.wordpress.com/2011/05/31/stop-giving-your-power-away/
I remember being very jealous of him when he sent back this photo (he was conducting research for his thesis in Athens at the time). It's a sculpture I've always been in awe of. Classical and Hellenistic Greek sculptors really were amazing!
My other favourite (yes, I've posted it before) is the very dramatic Horse of Selene from the Parthenon. Selene was the moon goddess - this fragment remains of one of the horses that pulled her chariot. Now there are some sculptors who clearly spent ALOT of time looking at horses.