The fastest easiest way would be to work with scan data. That's what I think a lot of games studios will be doing - much more cost effective. From a Poser POV though, go look at the sort of prices for commercial usage ...

Anyway, this is what I could get from P11 back in 2015 with a free head from Ten24 (aka 3dscanstore dot com). The eyes are rough as it's a single mesh item, they aren't separate - image is post processed and eye highlight painted in. I did convert the 8 bit bump to a normal map, but the shader was ridiculously basic (and I wouldn't use it now!).

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