Use case: product-mockup. Reference image: green stone podium, oversized circular arch, and botanical shadows only. Create a clean vertical 2:3 calm moss-green product display backdrop with a low round green-gray marble podium centered in the lower third, a large pale-sage circular arch rising behind it, two irregular natural gray-green stones near the lower side edges, and layered leafy branches entering from the upper left and right to cast gentle shadows. Keep the podium surface empty. Elegant photorealistic studio render with soft side light. Change stone shapes, arch curvature, leaf arrangement, podium diameter, marble grain, and shadow pattern so it is related but not identical. No text, numbers, Chinese characters, watermark, logo, brand mark, tiny edge text, border, or white margin.
