The next step is to copy the picture onto a piece of transparency film.
Cover the card stock with aluminum foil. If you crinkle it, you get a better effect as the light bends when it hits the different wrinkled parts. When I showed my students the effect, with and without the crinkling, they preferred the crinkling.
I tape the foil in place on the other side of the card stock.
On the back of the card stock I add a piece of Christmas writing done by the child that has been printed on Christmas paper. Then I put 2 holes in the top and add a ribbon so it can be hung.
If you don't want to mount it on foil, the transparency can be displayed as is in a window, or on a mirror.