The washer is attached by folding the cording in half, slipping the loop through, the hole, then the loose ends through the loop... just like you would if you'd cut the hole in the paper. I just did it before I glued the paper onto the washer. And I only used one strand of the cording so it wasn't as bulky under the paper as it would have been otherwise. The second strand you see, I just threaded under the loop once everything was nice and dry and settled.
The back is covered in a coordinating solid color cardstock.
I glued the big flowers to the pendant before glazing it. The small flower I glazed separately and then attached. After those pieces dried I attached the rhinestone.