The way I work around the faces is to first, buy some REALLY nice V4 character sets. About 1 out of every 30 sets will feature a unique look. Most of the stuff you'll find are nothing more than some skin thrown on top of a slightly morphed character using Poser's default dials. Some good sets are like and of Aery Souls characters, Brooke 2.0 from Daz3D (today is the last day to get her for half price http://www.daz3d.com/i.x/shop/itemdetails/-/?item=5587 ), then there's Lecretia from RDNA (http://www.runtimedna.com/mod/bcs/index.php?ViewProduct=3014&TopID=163266 ). And then I'll use Dulce from Daz (http://www.daz3d.com/i.x/shop/itemdetails/-/?item=5446 ). 

What I found is that in Poser 7, once you inject a particular morph into your V4 model, in the list of pose dials, Select the head and then scroll all the way to the bottom of the list. The last dial will read the name of the charater dial you just loaded with a value of 1.0 next to it. Simply dial down a bit and you'll notice the head/face look a tad different. It's as if you are melding the injected character with the features of the base V4 to come up with something more "unique."

Also what I like to do is take the base V4 and tweek the body up a bit. Add some size to her hips, give her a slight tummy buldge, add in some Posermatic's NGM, and give her some muscle definition. Then, I'll inject a character morph to the head only to give V4 a whole different look. Also, one of the most underutilized aspects of changing V4's overall look is trying the right hair style! She can really take on a whole separate personality simply by using the right hair. You can ge more sultry looks out of a base V4 just by using hair the may cover one eye.

When I get home, I'll make some renders and show you what I mean.