Raise the 'wound edges' using a Derma Wax spatula, lightly lubricated with Cleansing Cream. Opening the wound edges up allows you to create a tattered effect.
To add a suggestion of depth to the 'wound', colour the bottom of the wound using black make-up. Then you colour the inner side of the wound with dark red make-up (Grimas Water Make-up Pure or Crème Make-up Pure).
Slide a piece of bone into the raised structure.
Finally, you add Grimas Blood or Filmblood to get the required effect. Use a Stubble Sponge or a tissue to disperse the blood around the 'wound', if desired.