After I had done enough layers of paper mache all over the head for it the hold its shape I did a layer of gum tape over it all to give extra strength.
I added extra layers of gum tape around the the forehead motif and any weak points to ensure it was robust.
Here is the finished layer. I marked out in gum tape a better eye shape.
After this I i started sculpting a better shape on the cheeks with paper mach
I continued this technique and smoothed out the rest of the shape.