If you DON'T have eyebrows painted onto the head texture:

Go to the Materials Room. (Advanced tab) Go to Transparency node, right click then attach a new node. 2Dimage map. Click on the NONE at the top of the newly attached node. Browse to where your eyebrow texture is. Select it. Set Transparency and Transparency Edge to 1.0. Set Transparency Falloff to 0 along with Spectacular value. Do the same for the eyelashes.

Render settings to get the best lashes:

In Poser 6, set the max texture size render setting at least as big as your transmap. Do not enable texture filtering.

In Poser 7, you must turn off the texture filtering on the Image_Map node instead of render settings.

In both P6 and P7, render with Min Shading Rate = .2, and Pixle Samples at least 3 to 5. If using shadow maps, use big ones, and use a spot light for closeups instead of infinite lights