To apply the shape you've made to a photofit face:
1. Save the face with the desired shape to a file such as shape.fg
2. Run the photofit (or load a photofit face from an FG file)
3. Go to the 'Tween' tab
4. Hit the 'Load Target' button and select your file shape.fg
5. Unclick 'sync lock' at the bottom and Symmetry 'S' (for shape) from Current to Target.
Best wishes,