What symbolic element conveys the message that augustus is a deity in augustus of prima porta?

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.

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