I have a few minutes ... let me just give you the step-by-step quickly for lightening (or changing the color to anything at will) the brow.

1. open face map in Photoshop (Paintshop Pro, Gimp ...)
2. Duplicate map
3. De-saturate color
4. Raise the contrast
5. White out all but brows
6. Invert to make a transparency map
7. Save for Web as brow transparency
8. open advance material room in Poser
9. Choose "eyebrow" from your character
10. add node to transparency, 2d, image map and brow you saved.
11. Turn GC to .5
12. Change color as desired from diffuse color.

Bonus: change the displacement map in the brow to bring out the 3d of the brow.

I hope this helps.  Ask questions as I didn't add any samples in my step-by-step cuz this is quick so I can make an appointment. :)

Boni

P.S. You may want to add a slight tint to the sclera, cream or even grey-blue to tone it down ... very slight.  Again, add bump and even a little reflectivity.  Just a suggestion.

Boni

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"Be Hero to Yourself" -- Peter Tork