A Beastie in The Pond

I saw a swirl 
Then a breach
As a creature rose
From out the deep.

Long slimy teeth
Sharpe scary claws
Spiky green scales
A bone-chilling roar.

It had none of those things
It was lilac and smooth
Had beautiful eyes
And ruby red shoes.

An obsidian belly 
All glassy and black
An elegant neck
A pearlescent back

It had great silken wings
Like a pretty pink bat
And silvery hair 
That it wore in a plait.

Its voice was so sweet
Not at all like a sharks
It bowed when it saw me
Then plucked at its harp.

It sang me a song
Poseidon's Lost Love
Of a mermaid it new
And a gifted white dove.

I don't remember much else
I tried for a snap
But my camera was wet
And the picture was crap.