Well, I think I've had a major breakthrough.  I've enlisted a pair of eyes that has had no exposure whatsoever to this project up until last night and furthermore has no experience with Poser or CGI at all.  In other words, I asked my grandmother for her opinion.  She's an intelligent woman who I trust to be honest even if it's something I don't want to hear.  In fact, the first two times I showed her my latest version of Natalie, she too had to look closely to see the difference and told me so upfront.  The third time, however, I am pleased to say that she immediately observed a "definite difference" and even went as far as asking how I'd finally accomplished the feat.

So, although Natalie may not be absolutely one-of-a-kind, I feel confident now that she at least looks markedly distinct from default V4.  I hope you agree.

You may also notice that the eyebrows look a little sharper.  I did some work on them as per some advice I got here.  Please let me know what you think.