奢华阶梯上的黑色礼服肖像

9:16 竖幅、超写实抓拍式智能手机时尚肖像：一位成年女性化主体端坐在宏伟宫殿式门厅中央的华丽楼梯台阶上，正面平视全身构图，身体略向后倚、双膝自然交叠，姿态自信优雅但不挑逗。她留长而柔顺的深色直发，一侧垂过肩膀，具有立体颧骨与自然饱满的唇形，目光坚定地看向镜头；保留真实皮肤纹理。她穿剪裁精致的黑色高领或适度露肩礼服式上衣与及膝或长款不透明黑色裙装，搭配黑色漆皮中低跟鞋、简洁金属耳环与深红色美甲；一只手支撑姿态，另一只手自然放在膝上，不强调身体敏感部位。明亮直射闪光与温暖吊灯环境光混合，形成高对比度阴影与服装高光；背景是抛光卡拉卡塔大理石台阶、金色纹理、几何丝绸地毯、精致锻铁金箔栏杆，以及右侧挂金色灯饰的巨大圣诞树，背景轻微虚化。鲜艳但受控的色彩、锐利细节、光泽杂志质感；无可读文字、品牌、商标、水印、裸露、露骨或色情化姿态。

【English Prompt】
Ultra-realistic 9:16 vertical candid smartphone fashion portrait of a generic adult feminine-presenting subject seated centrally on the grand staircase of a palatial foyer. Full-body frontal eye-level composition; she leans back slightly with knees naturally crossed, poised and confident but not provocative. She has long sleek dark hair falling over one shoulder, defined cheekbones, naturally full lips and a direct composed gaze; preserve authentic skin texture. Dress her in a refined black high-neck or modestly off-shoulder formal top with an opaque knee-length or long black skirt, black patent low-to-mid heels, simple metal earrings and deep-red manicure. One hand supports the pose and the other rests naturally on the knee without emphasizing sensitive body areas. Mix bright direct camera flash with warm chandelier ambient light for high-contrast shadows and glossy fabric highlights. Behind her: polished Calacatta marble steps with gold veining, a geometric silk runner, ornate wrought-iron balustrade with restrained gold detail and a large Christmas tree with golden lights on the right, slightly defocused. Vibrant but controlled color, crisp detail and glossy magazine finish; no readable text, brands, trademarks, watermark, nudity, explicit or sexualized posing.

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