I would create a mask from ao, curvature and a grunge map an use that as a starting point for roughness. Fiddle with that until you get something with more variation I would also add some blurred noise as a normal - masked by ao - in order to create some dents and wobbling in the surface
Just a Vase i've done for the monthly challenge but it took me some time to finish it (kinda). I would like to ask for some help regarding the questions i got still not resolved...May be it's just my eyes got foggy because i had to look at that vase for too many times and can't already judge how it turned out or may be i…