Ronnie NEVER looked grainy. He always looked smooth, even when his muscles and veins were popping out.
Black people have large amounts of collagen in their skin compared to whities, so they hardly ever get the grainy no-skin look precipitated by long term steroid use.
Graininess is essentially a sign of skin damage, as the skin becomes extremely thin and worn from the effect of testosterone and sun damage and the like. I believe this is why dennis wolf looks so fucking old.