Topology.

To ensure that the 2 heads were perfectly aligned and in scale with one another, I added rulers to the image.


I then added guidelines to the two images to give me a rough idea of how my face flows and were my features are.


Then came the 'ard bit of adding in my topology lines. This would give me a great base to work from in 3D-S-Max, if I got the lines right of corse.
After alot of line drawing and erasing, I finally got there and came up with this...