That looks pretty good, but if you want to improve it you can add cracks on some of those tiles (not all of them). Grass would be a good varience but consider creating Moss instead of grass at the first stage. Also you can add height variences among the tiles. Some tiles could be more slope, some are less for example. And…
Hey, I did this stone material today with materialize and one of my own reference images. The screenshot on the plane is made in unity I am trying to achieve realism / photorealism for a project. Since this texture is tiling across a big surface, I can't really make details that are too obvious, but I will in the future…