If bark around wood is healthy you can leave it in place. Mine were weak and falling off, so I just removed the bark all together and tapped the disks on the table to knock off any excess dust and grit.
You can either freehand your designs with a pencil like I did, or use mini cookie cutters for stencils. Another idea is to google some north woods decorations and print out a few designs to use. You can even use black transfer paper to add the designs to the wood.
Paint the designs black and let dry.
The beauty of this craft is that silhouettes require no details, you just have to make sure your outlines are recognizable.
When they are dry, spray with clear glaze. Repeat on the other side. Do a total of 2-3 coats.
Create bows out of jute or ribbon.
I used material strips from the leg section of boxer shorts that my boys had outgrown.
Hot glue to the front of the ornament, above your design.