Before adding sculpey to the armature it is a good idea to begin by marking the center vertical axis of the head and the center horizontal axis of the head as shown in the top left photo.
Think in terms of building up forms. It is a good idea to begin with the orbitals (eye sockets), nasal bone (nose) and orbicularis oral (mouth). Notice in the photo (top second to left) the area around the orbitals (eye sockets) is built up. The in the next photo to the right the parietal (the top knot on the skull) and the occipital (the knot at the back of the head). Periodically check the proportions.
The proportions are the relationship of the parts to the whole. For example, the eyes fall about 1/2 way between the top of the head and the bottom of the chin. This is a basic and important proportion. There are others. Any anatomy book will supply the proportions of the head.
Continue building up the forms of the nasal bone and the zygomatic bone (the cheek bones) shown in the photo on the top right. Try to notice what forms are projecting (coming forward) and those that are receding (going under or back). Remember, to create a form that recedes build up the area around it.
Add in the esophagus casing and in the back the vertebrae. Make sure to work the whole sculpture all the time - there is plenty for smoothing later. Add in the clavicle (collar bone) and the sternum the bone to which the ribs attach.
Continue to build up the forms until the skull and base are completed to satisfaction.
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