In Augustus of Prima Porta, the emperor was shown wearing no military boots even he was wearing full armor to go to a battlefield war. This missing detail is an indication that Augustus is god-like since gods are always depicted with bare feet. The symbol of a cupid sitting on the dolphin also indicated that Augustus is descended from the gods since Cupid is the son of Venus, the Roman goddess of love.
The symbol when Cupid is sitting on the dolphin indicates that he is a descendant of Augustus. So the mperor was shown wearing no military boots even he was wearing full armor to go to a battlefield war that indicated the meaning of this symbol.
