thanks all for their comments, helped me a lot.

following the suggstions you made, here a quick update.

   - added an additional cosine function to make the stones more pillow-like
   - removed the normal statement which added extra roughness (looks now cleaner)
   - randomly changing color_map which boosts reality effect
   - adjusted the rigged_mf function to fit better with the reference pictures
   - raised specular level and lowered roughness value to support the polished look


still not happy with the base texture, ...

... more suggestions ? (PLEASE...)

... dave

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