a simple underwater scene , with a mermaid. the tail of the mermaid, i made it from myself.
i thank tysury for its picture of the water, and i thank mqtrf for its picture of the shark.
and thank you , paulus62 for you picture of the little fishes.
a big thank you to http://imagebase.davidniblack.com for the picture of the women.

image modified to give a better lighting consistance to the image as mentioned by a few in my coments.

Just Photoshop....

red lake turns under the sea.