forensic sites and google "male vs female skull" can help.

I would say: round, elipsoid shapes make female, rounded-block shapes make male. Especially in the lower jaw and forehead. And of course texture, hair, etc do make a difference.

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though