So I'm struggling with the wheel rim's surface material and this is what I've done:

my work

The nodes:


(PBR material from Remington Graphics)

The real stuff:


(For more references check this out)

So I'd like to have a little noisy effect to make the surface a bit rough and looks more realistic, for the current one it's too shiny (what about HDR?) and it seems too smooth.

I had some attempts before this question comes out:

enter image description here

But I'm not sure if it's a proper setup, and should it be the surface color, or height texture feeding roughness??


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