painting on cardboard

i saw this technique some place online that said you can wet cardboard and peel away layers to reveal ridges to add texture to your art,  so i decided to give it a try it.  i ripped off cardboard pieces from a packaging box i received in the mail and cut a piece 6 x 6 inches.  i put a layer of gesso on the cardboard and let it dry. i painted the background with acrylic paints and scraped paint around with a credit card.  once that was dry i just drew a design and painted it.  i used a charcoal pencil to outline the drawing. i'm not sure if it is done or not. i feel like i want to add some paper to the background. but for now i'll just let it sit til i decide if it's done.