Your work looks really nice! To iron, just put an old piece of cotton batting, or a thick towel...something like that on your ironing board. Mine is two layers of warm and natural batting and an old sheet on top. Then turn your appliqued piece over and press from the back side. Use a little steam if you have to and a pressing (up and down) motion rather than an ironing (side to side) motion. This will work for most types of applique.