Changing NPC hair color changes skin tone!?

[RokHere]

Hi. I'm trying to make very simple tweaks. As an example, changing only the hair color of an NPC in Fallout NV, and I'm doing it via a simple override ESP file. The strange thing is that this worked fine before when I implemented several changes to another NPC, and using the same method. But trying to only change hair color for another NPC strangely resulted in changing the skin tone of the face and body of that NPC to sickly, pale white. What gives? Is there anything I can do to not make such changes rely on luck or chance?

 

Please find a demonstrative image attached.

 

Thanks to anyone taking the time to share advice and tips.

[RokHere]

And taking another look at her, it seems that a lot more than just skin tone changed! Is it just me, or does it seem like her nose, eyes, and eyebrows changed, too?!

[Unno]

Tick the 'lock complexion' box before changing the color?

[RokHere]

I figured out what the problem was: the Janet on the left in the image is modified by the excellent mod, NVCE - New Vegas Character Expansions by Machienzo, but when I modified her further, I was using the vanilla FalloutNV.esm file, instead of using NVCE's file (the correct ESP file). So the override ESP file that I created was overriding Janet in the game with vanilla data, rather than NVCE data! Well, vanilla data including my hair-color change. And the vanilla data—believe it or not—is as horrible as it looks at the right...ghastly white complexion, no eyebrows, eyes too far apart, etc.

 

By using Janet from NVCE's ESP file instead, I was able to change (correct) her hair color and preserve the beautiful look on the left.

 

Thank you anyway.

 

I hope my findings help someone else having a similar problem.