This is a close-up image of Poseidon wearing a lobster crown not unlike the one being worn by Poseidon in the mosaic of Poseidon and Amphitrite. This gives the viewer an idea of what the crown is supposed to look like, as the other image doesn’t display it as clearly.

Source: https://s-media-cache-ak0.pinimg.com/736x/09/aa/86/09aa86cf857295a02b6098038d450105.jpg
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