Less soft, squishy forms would be good to indicate concrete (hard), would take a while to wear down to that level i think.
Maybe some less intense alphas on the hp too maybe, dunno.
That looks a bit more like a natural stone surface or marble than concrete, I think. Seems to be the large-scale bumps and general smoothness in the surface that are doing that. Concrete would probably be chunkier and grainier near the edges.
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Less soft, squishy forms would be good to indicate concrete (hard), would take a while to wear down to that level i think.
Maybe some less intense alphas on the hp too maybe, dunno.
and choose more interesting subjects dude :P
It looks like some of your crack details are going out not in?