Underwater

For this underwater scene I used a picture of a garden for a background , of which I adjusted the hue to give it an underwater -like effect. Next I used the gradient tool to cover up the top half of the garden where the trees were and to bring it down so you could only see the gravel. Afterwards I added another gradient which was brighter at the top and darker at the bottom, which I added distortion effect to make it look like the surface.

To create the beams of light I used used the polyagonal lasoo tool to make two triangle shapes which I then feathered tjhe edges of to smooth them out, then filled them with white and adjusted the opacity.

I added the plane next. I made an adjustment layer to select a small area of the picture and stretch it upwards so you don't see the edges of the picture. Finally I added the shark in which I used a masking layer to paint out the edges of the picture so I just got the shark. I made the shark brighter to coincide with the beams of light.

Source images.