helmet cheeks

i need help with my helmet cheeks it seems that they are too big bit i cut them like they where in the layout and i checked if the helmet was too small but it fitted around my head perfectly, this is my first time making the helmet any extra advice would be awesome too

i saw tutorial on you tube.. however one year ago i built up my boba fett helmet with pepakura software and after built it with cardboard and superattack. after that i used the resin polymeric with the fiberglass.after i used polymeric stucco and after sandpaper. i spent a lot of time but the result was pretty (sorry for my bad english ) )

I also could use some help with the cheeks. I'm running into the same issue, and I'm using styrene (1/8") rather than paper.