Remove the plastic from the cheese.
Depending on the desired design, either leave the wax intact or pull the tab, which will create a "mouth" in the middle of the cheese round.
Use the candy eyes and/or the marker to create monster faces. Press the candy eyes into the wax to get them to stick, or use a little bit of nut butter or honey on the back of the eyes to secure.
Use a craft cutter or scissors to create teeth or other designs in the wax. Save wax cutouts to create monster ears. Refrigerate until ready to serve.