I hate eyebrows. Getting them placed is a nightmare. Getting them right is worse. They don't make stencils and the templates you can get online are too delicate to cut to make into stencils. And don't get me started on water-slide decals sliding everywhere except where you want them.
But I just figured out the perfect solution!
Print out a set of templates; Batchix has some on her website for resinoids. http://www.g36.net/ocdesigns/eyebrows/eyebrows1.gif
Color them in with watercolor pencils.
Tape to the forehead, colored side down. Now gently sponge the paper until it is damp clear through. Carefully pull up the paper. Enough of the color will have transferred from the paper to the doll head that you can use that as your guide to finish the eyebrows.