Head modeling in sPatch
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Where to start?
All of these models were made with extruding one basic curve, then with adding or deleting points.
Grey is first, black is last curve. Rest of curves were added later.

 
Start from profile 
This ussualy produces smooth shapes, and tends to look nice. Troubles starting when we want  to close model (inside black curve), or want to make more expressive face. We need to add more curves. All of these curves are ending at bottom. This produces too much points for joining with body. "He" from , was modeled in this way. 
Start from lips 
This can produce too much points on lips, but this is most promissing. It's very easy to make facial expressions without adding points (as we can see). 
This is maybe most popular way. It is also well usable for modeling 
non-human heads.  This way need the least of adding points. We'll start tutorial just with this. 
 
Start from eyes 
Not too much usable. Seems to be just an experiment. 
 
 
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