The Symmetry Modifier

In order to duplicate the topology that I had already created over to the other side of the face I used the symmetry modifier. By moving the mirror plane around, I could achieve the correct mesh. It was then simply a matter of dropping down into editable poly mode whenever I needed to edit part of the face and the modifications would then automatically reflect over through the symmetry modifier.

Once the symmetry modifier was applied, I also applied the TurboSmooth modifier. This was used in order to obtain a nice smooth finish as the shapes created earlier made for a very low-resolution face.