How is this for a nipple mask? I made it 4096x4096 because the nipples are fairly small UV-wise. You might actually still see a bit of a sharp edge in Poser because if I'm not mistaken, I left the hard edges in in that version of the mesh. If they bug you, you can edit the .obj file and remove all lines reading 's 1' or 's 2'. Or I can send you an updated file.

Yeah, eyebrows are probably beyond what can reasonably be done with a procedural shader. I'll find some references and try to turn them into an eyebrow map.

-- I'm not mad at you, just Westphalian.