Just sharing a few short videos I made of myself sculpting some little 12" doll faces out of ProSculpt.
I like this particular brand of polymer clay as it is denser and holds its overall shape better as you work it. Once you get a certain part done the way you like it, you can bake that part and then iteratively add more clay to refine it.
Step 1: Initial Face Sculpt
Step 2: After Baking - Adding Ears
Step 3: After Baking Again, Refined Eyes
Step 4: Female Face
Step 5: Owl Man
Another character: Owl man (in progress)