Yet another WIP Zbrush bust from teh Scooberz that'll probably never get totally finished. Eye balls are just placeholder for Zbrushing and will get redone when she makes the leap to real-time. Stole some photo refs for the eyebrows, a little bit on the lips and around the eyelids, rest is hand polypainted.
Could you use projection master, take a screenshot into photoshop and create a new layer with a bezier curve of the shape you want, and save that layer to use back in zbrush? I would give you a more detailed rundown, but I'm not as familiar with zbrush as I am mudbox, so it would be a bit rough. Hopefully I've pointed you…