Are you using P4 or P5? It's basically the same method but the terms might be a bit confusing from one to the other. Basically, the easiest way to do it, and the way most texture makers use, is to make the eyebrows totally transparent (so transparency value of 1.0 and falloff of 0) and just paint the eyebrows onto the head map. Don't put any map onto the eyebrow material, just leave 'em transparent. Your other choice is to plug the transmap into the trans node with a trans value of 1.0 and set the diffuse colour to black or dark brown. the main problem I have with V3 is that her material zones work differently to V2, so it's difficult to remember what material to put where :-)

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire