Thresher shark - Alopias pelagicus

I love the thresher shark. It whips its prey with it's long back fin which can be as long as its body.
(The French call it requin renard, the fox shark)
I drew that one in the dark and thought I'd grabbed my black pencil when it was in fact purple. When I realised my mistake it was already too late so I continued and added some black on top of it but in the end I'm glad I made that mistake because I like the result.