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On that thought:  how does a modeller make a good nuetral face for morphing?  Is it possible that a neutral face doesn't even look human or defined in any way?

You can use genesis for a good case study in that. Its a really good figure. Its only (And a biggie) downfall is that they made it DS only.

Also, a great deal depends on the expected average skill of your target content makers. Some can do a lot with a few basics, others need more.

I would probably start with basic figure drawing canons (and proportions)

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Renderosity Store  Personal nick: Conniekat8
Hi, my name is "No, Bad Kitteh, NOO", what's yours?