Ok, here we have a comparison, full body and head only.

First, @ piersyf, unfortunately during the creation of Tina Perez, my last laptop crashed (literally on the floor) so I had to save up to get another one, I haven't installed Poser on this one yet.  On my main computer, I can't render IDL lights scenes, and if I attempt to do partial renders, each partial renders will be slightly lighter/darker, if I'm thinking correctly, it's because of the location of the "lights".  My old CRT monitor on my computer is a little darker then the laptop monitor (which is LCD of course) so I should've loaded the images and check them out on the laptop before uploading the promos.  Seriously thinking of redoing the promos.  For now until I install Poser on my laptop, I'm just doing my best using IBL lights, using AO for the more natural, less flat shadows.  I realize my shadows were too dark, highlights too light so I played more with my lights and did these renders below.

@longprong... admittedly there's more similarity than I wished for, as I made these two girls (Lucy Zepp age 20, Tina Perez age 21) as cousins, but there are differences.  First, the skins come from two different merchant resource textures.

You can see some difference, their height, weight, hip, breast size,  jaws, chin, eyes and even slightly on their noses.

...wolfie