Quote - But is there enough to at least set her apart from the default Victoria 4?

In my opinion? No :(  TBH I have to stare and stare at your image and look at  small parts of the face and then look at that same part of the V4 face for me to see any difference.

I must have looked at that side by side comparisson for a hour before I saw that the crease in the inner corner of the eye is wider and the mouth when looking front on, is not as wide.  Those are the only changes that I noticed.

You are probably seeing huge changes between your Natalie and default Vicky 4 because you are staring at her and turning the dials so you aren't objective. It's reminds me of a Mom who seems astounded at the fact that people can't tell her identical twins apart when to her they look so very different. It's a case of being to close to the "project"  which results in tunnel vision.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi