The displacement starts becoming visible very close to 0, even .05 in the Overlay_Mask will make a noticeable rise here. But the color blend doesn't completely take over until the Overlay_Mask is considerably more than .5, 10 times that. Until then, there is a lot of skin color in the blend.

Think of the mask as a number from 0 (BLACK) to 1 (WHITE). That's what it actually is. The gradual rise in displacement means there are numbers between those. But you want the overlay color to take over almost immediately.

The solution is simple. Increasing the Blender_Diffuse_Color.Blending value from 1 to 100 or even higher. The faster that rises, the less skin will carry over into the masked area.

You don't have to worry about this number getting way higher than 1, because it is Clamped automatically at 1 (and 0 as well, no negative numbers leak through the blender).

So the modified numbers will look like this:

Displacement = .001, Color_Blend = .1

Displacement = .003, Color_Blend = .3

Displacement = .01, Color_Blend = 1

Displacement = .05, Color_Blend = 1

See?

 

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