get the mask here
http://www.beautyanalysis.com/research/perfect-face/facial-masks/

 

render front and side face of your characters
in your 2D app
put your render on layer one
put the golden ratio mask on layer two .mask and erase the white.

golden ratio mask it's for 9 eyes tall not 7 eyes tall.
I don't no how many eyes tall V4 is
since where making greek versions and not real humans might need to modify the golden ratio mask a bit.
would need to modify for kids also. 

as to why
the closer your morph is to the golden ratio mask.
the better your odds for more sells :)

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance