There are techniques available that have been outlined in other threads on making renderer GC and IDL work together, but as in anything else: it's up to the user how the image is meant to turn out. You're obviously a true artist in that you have a clear image of what you want to produce. Mine is far more nebulous: I wanted pale skin, dark lips, black hair and somber clothing. These all turned out pretty much the way I'd intended. The lip colour is precisely what I was after: it's what I had dialed in in the shader (shader-based makeup).
So, GC didn't do anything to my colours at all, at least, nothing you'd describe.

If you're saying her face/skin is pale/greyish: that's by design. Her lips and eyes and hair aren't. If GC were to render things grey, wouldn't it affect all objects in the scene?

Guess I'm not following. My monitors (I have 3: a netbook, a laptop, and a 5000:1 LG Flatron Wide monitor) and the above image shows up roughly the same on all of them.

Guess it's all what you're used to.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks