I've always had great sucess using Shep Paines technique for figures.
Heres the directions from start to finish 1.Do not t any whites in the eyes because eyes appear the same color as the face in viewing distance.
2.Paint a wide band of light blue or brown verticaly through each socket keep each band the same distance from the nose.
3. Paint a narrow band of black or dark brown down the center.
4. Cut off the top of each eye band with a dark brown line this is the upper eyelash. Concentrate on positioning the bottom edge of the of this line correctly keeping the 2 eyes level from side to side let the rest of the line fall where it may.
5.Add half of a bottom lash.
6. Carefully trim the eye down to size with a flesh colored paint.
Also eyes are more of a wedge than an ovel in shape, this is how Shep writes it in his book and it is amazing with a little practice how easy and effective it is. The book is called How to build Dioramas and is published by Kalmbach and if you only own one book on modeling this is it (my humble opinion). There is a full drawing of the technique is his book and Im sorry I cant show it to you as it helps a lot also. Armorama and Missinglinks have also had articles on face painting and are very informative (and great sites ta boot also). good luck