Draw The Face
Use a Sharpie to draw a face on the shell. It doesnt need to be perfect, just give yourself a general idea of the shape and positions of the facial features
Cutout the Features
Use a sharp knife, a serrated blade works best, to cut our the facial features. Leave some supports in the center of larger cuts such as the mouth. These will help the paper jack-o-lantern keep it shape until we add the harder paper clay later.
Unlike working with real pumpkins to get a great looking paper mache jack you will want to add material not just cut it away. Use rolled bits of newspaper and tape to buildup features like eyebrows, a protruding nose, and, of course, a stem. You can also use hot glue to add other items such as polymer clay teeth.
Make the shell
Build the face