Sketch your design onto the plastic mask using the dry erase marker. Make sure to leave a space for the ribbon.
Start with the colored flourishes of the mask. It's ok if they don't stick to the plastic base, just put them aside for when you are ready to fill the white.
Start filling the white around the mask. Start on the outside edge and make sure to leave the nose section for black. Attach the flourishes as you go.
Fill in the nose and the eye sockets with black last.
Notes
I made the mistake of using black first and that left behind residue in the pen that transferred to the white and different color flourishes. I suggest using black last if you have a colorful project!