For the rock surface I used the rock detailer node made by Daniel Thiger and I build the rocks structure thanks to his rock series tutorials. I can only recommend them, it speeds up production quite a lot. https://gumroad.com/l/detedetailer
https://www.artstation.com/dete
The naked and painted stone substances are based on my own experiments with Substance Designer.
As always, great support and feedback from the WeekEndProjects discord and my close friends there.
https://www.artstation.com/albertocordero
https://www.artstation.com/laetitiabertrand
https://www.artstation.com/albertognolo
Thank you very much!