Hi. There are MayaDoll free characters that have additional expression morphs. Then you can use the morphmanager to transfer the expressions to a different MD character. The "racequeen Rie" had additional morphs (if I remember correctly). It's at StudioMaya's site. Ken1 at posergirls has some lovely MD characters and they have some additional morphs too. Can't find the link now, sorry. There was one MD character that had tons of headmorphs but I can't remember what it was called. I'll try to find the name and the link if I can.

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