I think it already is a metaphor. You're comparing 'her eyes' to 'the sea'. Maybe you could go into some further detail here by describing that particular 'sea' more comprehensively, or by using another verb for 'were'.
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IvanhrIt sounds like a comparison to me. Metaphor is an implicit rather than explicit comparison.I understand what you mean. But I would then say that both 'her eyes were like the sea' and 'you could drown yourself in her deep blue eyes' are metaphors. Yours, in my opinion, is only more comple
You could drown yourself in her deep blue eyes.