美术风绘画光效棚拍

生成一张 4:5 竖版美术风绘画光效棚拍。主体是一位 60 岁以上白人男性艺术家，半身坐姿，穿深灰亚麻外套和白衬衫，手持旧画笔和素描本。身体、肩颈、手臂和头部比例自然。画面参考古典油画式棚拍，深色摄影棚背景，柔和暖金主光从左前方斜射，形成伦勃朗式三角光，面部皱纹、胡须和手部纹理真实清晰。真实摄影，油画感光影，浅景深。无文字、无 logo、无水印。

Create a 4:5 vertical fine-art studio portrait with painterly lighting. The subject is a white male artist over 60, seated in a half-body pose, wearing a dark gray linen jacket and white shirt, holding an old brush and sketchbook. Keep the body, shoulders, arms, and head naturally proportioned. Use a classical oil-painting-inspired studio setup with a dark background and soft warm golden key light from the front-left, forming Rembrandt-style triangular light. Show realistic wrinkles, beard texture, and hand details. Photorealistic with painterly light and shallow depth of field. No text, logo, or watermark.