How to reproduce the fine details of the environnement I can expect that rough asphalt like in the image would need to be sculpted in Zbrush, but should fine cobblestones, tiled floors and fine joints in masonry like in the next image be sculpted or can they be reproduced with textures? (1) Reproduce with textures.(2)…
Usually this type of stuff is set dressing added on top of more clean and generic tiling textures. Decals or mesh decals, scattered rubble, vertex painting, etc.
For the middle image ( with the red "circle" ) you added on your other post the Tomoe Matushima reel video.. https://polycount.com/discussion/235608/how-to-determine-the-texel-density-in-the-video and at 0:27 you can see it's some geometry ( a flattened cylinder/tube ) and so the rest is some texture.. but maybe there is…