Open the original image, use the magic wand and then deform it
step 2 of 7
Duplicate the image, even make them deform the shape of fish. Then cut a piece of the tail using the marquee tool, and drag a duplicate of the other until it resembles a leading figure below
step 3 of 7
Using pieces of the original image, make fins and then duplicate them until they are like the picture below
step 4 of 7
Open the image of the fish, copy and remove only the eye and put on a new layer, setting the color to green