In my opinion, the whole face is the main point of attention when viewing and admires a drawing, then it is only fair to do it pretty well.
I have 3 tips that can help those who have difficulties in making this part as detailed in a drawing.
One. the space between the eyes is usually other eye that is viewed from the front, so the space changes depending on the angle.
2nd. eyebrows do agree, thicker and desformes male, female thin and well designed, remember that eyebrows practically part of the eyes.
3rd. eyes and nose and mouth, is a set, then nothing caprichar only the eyes, the face will always be first seen and appreciated first, then the criticism goes for the rest of the drawing as hands, bust, or until crisp and details , the face being beautiful, to forgive the rest of (my opinion of course)