Luxury Marble Stairs Fashion Portrait

Create a highly realistic full-body fashion portrait of a young woman sitting elegantly on wide marble stairs inside a luxurious, sunlit modern building. She has long, straight dark-brown hair with soft bangs, natural facial features, a gentle expression, and realistic skin texture. She is wearing a rust-orange utility jacket draped over her shoulders, a cream ribbed knit sweater, a dark navy buttoned vest, high-waisted wide-leg navy trousers, and elegant rust-orange pointed-toe high heels. A matching structured rust-orange handbag rests beside her. She sits naturally with one hand supporting her face and the other resting beside her, relaxed editorial pose. Large floor-to-ceiling windows in the background reveal a softly blurred city and distant mountains. Warm golden sunlight streams through the windows, creating beautiful natural highlights and soft shadows across the marble architecture. Photorealistic fashion photography, luxury editorial aesthetic, natural skin texture, realistic fabric details, soft warm sunlight, shallow depth of field, cinematic composition, high detail, realistic proportions, subtle film grain, 9:16 vertical composition, no text, no watermark, no CGI or artificial