Textures

Concrete

When we looking at the whole scene, we can see the gross concrete textures. I used a V-Ray dirt material and Glossiness maps to make this texture. When selecting textures, it's always best to use high-resolution ones.

When you use Glossiness and Reflect maps, you may not feel the reflection effect. This effect can be felt much closer to the light areas. You can see the settings I used in Fig.01.

Grass

I used the V-Ray Displacement effect to make the grass in the scene. There are several points that must be emphasized here. The segment number of the grassy ground is not an important element for V-Ray Displacement. You need to adjust the rate of Tiling with UVW. And you can use the black and white bump image of the grass texture to give the height of the Z axis. In general, it would be logical to use the 2D surfaces such as Plane (Fig.02).