or
1. Open the 2 pics (the bodies and heads) in different Paints (the program)
2. Make sure the filler color (the random color placed in the background) is the same for both pcs
3. Use the dropper tool to copy the filler color into the right click.
4. When you select something (a head for instance) with the select tool, 2 boxes will appear at the bottm of the Tool Box section t0 your left(They have a Cylinder, Sphere, and Cube image in them). Select the one on the bottom. It allos the color in your right click to be transparent(not visible).
5. Then simply move the head onto the body pic by means of Drag-N-Drop.
You may want to open a 3rd paint program that way you can move all the imags you want from the other 2 to this one to work.
Hope that wasnt too dificult to understand.