i would be a mermaid fair

And all the mermen under the sea
Would feel their immortality
Die in their hearts for the love of me.
Tennyson, from 'The Mermaid'.

I like to imagine mermaids looking like this - calm, superior, and alluring, with fish scales like sequins.

Photo of Paula Gellibrand by Cecil Beaton, 1928. Via the ugly earring.