写实3D渲染，复古雕花黄铜古董钥匙，垂直直立放置在纯深灰色哑光平面背景上，钥匙顶部为对称鸢尾花浮雕装饰，带有卷曲涡纹镂空设计，下方两侧配有小型金属挂环，圆柱形黄铜杆身做旧处理，表面有斑驳氧化磨损痕迹，杆身依次刻有三处菱形凹陷纹饰，靠近钥匙齿处设有环状凸棱，底部为T形复古钥匙齿。柔和单侧影棚布光，在背景平面投射出浅淡斜向阴影，突出黄铜的金属温润光泽与做旧细节，静物特写构图，钥匙居中放置，深暗冷调影棚环境，1:1方形画幅。

Realistic 3D rendering, retro carved brass antique key placed vertically upright on a pure dark gray matte flat background. The top of the key features symmetric iris flower relief decoration with curled scroll hollow design, small metal hanging rings on both sides below. The cylindrical brass shaft is distressed with mottled oxidation and wear marks, three diamond-shaped recessed patterns are engraved sequentially on the shaft, a ring flange is set near the key tooth, and the bottom is a T-shaped retro key tooth. Soft unilateral studio lighting casts a light slanted shadow on the background plane, highlighting the warm metallic luster of brass and distressed details. Still life close-up composition with the key centered, dark cool studio environment, 1:1 square aspect ratio.