preserve the original ground material exactly as in the sketchup model the courtyard surface is compacted sand and fine gravel light beige color natural texture matte finish continuous across the space do not replace or reinterpret the ground material as concrete stone terrazzo or pavement maintain the sandy gravel surface with realistic texture subtle irregularities and natural appearance all lighting and people should integrate naturally with the existing sand and gravel ground material photorealistic architectural visualization realistic material preservation editorial architectural photography style compacted sand ground fine gravel surface sandy texture natural beige gravel preserve original material no concrete ground
