10-03-2013, 05:31 PM
Another thing to keep in mind when drawing faces is that there are both hard and soft shadows. If you paint everything with a soft airbrush, regardless of the values, it's going to look very mushy. Use a hard brush to start with, block in some really rough shading and then keep refining it, you can always go back and soften it up later and don't add detail until the very end. But it's an awesome start, especially without any reference!