I am trying to detect the direction of the head so that I can give it a face in POV-Ray.

I can get roughly in the correct direction (usually about 30 degrees out) using some rotations with the rot0 to rot11 values.

Is there an easy way to find out the rotation from the given matrix transformation (or other information)?

I have already spent about 2 and half hours on this, so any help will be appreciated!