Pixiq

One of my best selling pictures in stock photography is this composite I did when I first got into Photoshop in 1991.  It a braciosaurus apparently swimming through a tributary of the Amazon River. I remember being so amazed at the time that as I looked at the image, even I couldn't tell it was a composite.

In order to make the dinosaur look like it was in the water, I selected it with the marquee tool such that the bottom of the selection defined where the water line was going to be.  I then pasted this upper two thirds of the reptile into the scene and moved it in place with the move tool.  In order to make the reflection, I pasted the selection into the scene again, used Edit > transform > flip vertical, and moved the inverted into place.  I lowered the opacity of it, darkened it, and I finally I used the smudge tool to disturb the waterline so it wasn't so straight.

I then did the same thing to the dinosaur in the background, reducing it in size by using Edit > transform > scale.

I created this composite in Photoshop 2.5, several years before there were layers.