Try this:

Mermaid mermaid of the deep blue sea
I call to you with an urgent plea
Sister of water, from oceans below
Transform me and I with the water will flow
A wondrous, marvelous beauty I shall be
Kingdoms of glory will fall before me
… Read more

As a beauty, I am not a star.
There are others more handsome, by far.
But my face, I don't mind it,
For I am behind it,
It's the people in front whom I jar.

This is the whole limerick. There are, however, other versions with a few minor variations.