Step 1: Print Templates I - Mask
Now if you have a cardboard printer, now is the time to use it (I wish I had one). For those without fancy awesomeness, just a regular black and white printer is all you need (or trace off a monitor, etc).
Print off the two images on this step. Ignore that the image is messy, it wont matter.
Next, tape the paper to a nice piece of cardboard. Grab an x-acto blade and trace cut your image onto a firm sheet of cardboard (good cardboard). Start be cutting the lines closest to the center, this will help you avoid ripping the paper latter, along with keep the paper taped in place properly.
Do this for both images. It doesn't matter if you use exactly the same type of cardboard.
Finally, you will need to make a cloned duplicate of the shape of each piece. So you will have two face pieces and two whatever-shaped pieces. HOWEVER, you only need to make one copy of each nice and pretty. The duplicate only needs to be a solid cutout to go behind the intricate image so you can paint a background.
Wait, not done yet-- you will need to make a somewhat complicated bend in the face mask piece(s), both of them. Make a cut through the cardboard (in the location commented in the picture) and then push the halves together to get the mask to bend as if to fit your faces bend a bit. You will have to do this for that piece's duplicate as well except the cut will be much larger to get the bend to work right (cut about half the mask down on that piece). Ask questions in the comments space if you have any...
Set these aside for now and continue to the next step...