I love working in clay. It's soft and cool, so it's very soothing. It's flexible. If I don't like what I've done, I just spray on some water, smooth it out and start over. Above is a picture of the one I started today.
First, I cut off a slab and knead it(called wedging)to remove any bubbles, then I roll it out until it's about 1/4 inch thick. I add newspapers to the back of the slab to support the facial structure. Then I start sculpting. I push, pinch and add to the clay to form the eyes, lips, nose and the rest of the features. I've used this technique to make many of the faces in my mixed media pieces in the past.
Today, I'm starting a new series. I'll be sculpting clay faces, bisque firing them and finishing them with paints. Here's a picture of one with paint.