Fangs, white skin, widows peak, boney, dark circles around the eyes, maybe some blood, pointed nose and ears etc.
Here are some examples of clay masks
1. Have one very detailed sketch or your stereotype
2. Use plastic mold with a bag over it as your base for building
3. "build up " your features
4. carve away recessed areas
5. be very selective when glazing, make your colors accurate
6. use lots and lots of color!!!!