The wallpaper texture is too small, the wall is too large, and the distance is far away, so the wallpaper cannot be seen clearly. It is recommended that you increase the pixels of your wallpaper, or find a new picture with clear pixels and a larger image, so that the pattern of the wallpaper can be seen clearly from a distance. With this texture, you can also render only a small area of ??the wall alone, and you can also see the pattern of the wallpaper. You can give it a try.