This is a remarkable achievement in scratch building at your age or any age for that matter, especially considering that you are employing pep/fiberglass methods rather than sculpting/vac-forming as this armor is traditionally made. That said, there is an overall roughness to your edges and seams that reveals your methods. I would continue to work to smooth those out. Some of the other details are actually too sharp for the look you are trying to achieve. For instance, the ear bumps are quite crisp; however, the reference bumps are much less defined due to the vac-forming process. I would work to emulate that a bit more in your build if you are seeking approval.
So to recap:
1. soften your angles
2. smooth your edges and seams
Amazing start.
-Todd