All you need to do I found was to select the eyebrows in bryce, then move the view around so that you are very close to them - but looking at them sideways, - either adjust the director's camera manually or try left or right view - depending on where the figure is positioned.

Then you just move the eyebrows a teany tiny amount so that the edge of the eyebrow image/mat/mesh, whatever it is, is no longer partially poking through the head.

I believe that's what's causing it though, poke-through.

Measure your mind's height
by the shade it casts.
Robert Browning (Paracelsus)

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