https://gamesartist.co.uk/roman-mosaic/
Environment Artist Furkan Malli breaks down the creation of this Roman Mosaic material. In this article, he discusses the inspiration & reference gathering, building base patterns, shaping & refining tile details, adding height variation, developing colour maps with organic variation, lighting & rendering.
https://www.artstation.com/mehmetmalli
https://www.artstation.com/artwork/DLOrJo