search for shrink wrap bags on amazon, they come in different sizes, heat gun to shrink them, I think a hair dryer would do it too just take a little longer.
Given that all I have done is read about this process, my understanding is glue the pic to the 1/4 piece, glue the pattern to a sacrifice piece, and stack cut, sacrifice piece on the bottom, the pic piece and the pattern piece. What I have read is that that you need that kind of sandwich to prevent the blade from ripping the picture on the upstroke and reduce fuzzies on the down stroke
I know there is something used in scrap booking that some use to cover the picture after cutting, just not sure what it is.