Here's what you need:
Yupo, Mylar (or I'm guessing any sort of synthetic paper will work that will hold a waterbased image well)
Soft gel medium
Spray workable fixative
watercolor or acrylics (including inks)
Create your image on the paper you are using and let dry. Once it's dry, spray on a layer of workable fixative and make sure it thoroughly covers the image. Allow the fixative to dry completely before laying a thick layer of gel medium. Don't be stingy because once the gel medium is dry, you will need to peel it off the paper. If you aren't generous with it, when you peel it, it will stretch or break easily. Also, you want to make sure the gel is completely dry - you'll know it's there when it is clear. A small word of caution, it tends to stick to itself so be careful while pulling it off.
Here's the results of my impatient skin.
I haven't decided how I will layer this into my journal, but I think I will probably create more skins from the painting that I have and actually follow my instructions for once.