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I like the liberties that you have taken in the hair and background, only wish that you would have dared some more in the skin-colors.
The photo seem to be lit by northern light, outdoor in the shadow. This makes the lit parts and highlights to be cold / blueish, instead of yellowish.
The grooves in the head should be more warm because the color you see there is reflections from the skin itself.
To understand this I will compare with what happens in a colored room.
If you paint one wall in the room, the color will be a mix of the color coming from the window and the wall-colors. If the light hits another (white) wall before it hits and reflects from the colored wall, it will still be the same as direct reflected. This is what happens with reflection from a plane surface.
When light hits a groove the colors reflected will be more intense and darker. Compared with the room phenomenon, the (neutral) light comes in from the window, reflects on a red wall. The reflection from the first wall will be red light shining on a red wall and so on. The lightspot on the wall will be less red than the unlit parts, though lit by white light.
You have seen it right on the lips, where the red color get stronger as it vanishes in the dark of the mouth.
Also look at the light / dark scale by squinting your eyes.
Allan
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