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Can you post the wireframes for this? Something seems strange with the geometry and smoothing groups and the edges of the geometry. Also I would up your render settings, you have a lot of noise in your images. Maybe also with the reflection go with something more neutral, the harsh reflection of the red building and floor texture is very distracting.
https://imgur.com/a/XgE2bB4 I don't really know how to make a good wireframe image but hope this works, there's 1 not subdivided and the rest are subdivided.
For the render i used leadenhall market HDRI and some planes with emission inside the helmet so you can see the interior. Used 128 samples, no denoiser.
