Cut the illustration and cardboard in some shape you like (I suggest circular and to small to medium size)
Stick them together
Glue some lace fabric at the back (I add some sequins for an extra touch)
Give a coat of nail varnish,let it dry
Carefully cover the fully image with clear tape,cut the remaining tape
Place the embellisment(s),and add a coat of white glue,let it dry,it neeeds pacience!
If you want, glue lace ribbon around the back
Finally stick the safety pin with glue gun
Listo! wear them in some cozy sweater,your backpack e.t.c,you can made many more with other kind of illustrations(pin ups,collages) your imagination is the limit.