Are you looking for critique? I guess I'd say if you arent going to texture these then I'd maybe make the HDRI more apparent. I see you have it in there but the metal looks very fake at the moment. If you really wanna make these look badass then I'd texture them a bit and add localized grunge etc. For now I'd say bump up the reflectivity with the HDRI to make it pop more. Consider trying to use a dark/black diffuse with high specular and reflecticity to give it a nice chrome metal look which will add more flavor to them possibly. This kinda depends on what and how you are rendering this with.
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