提示词 prompt：如下：

```json
{
  "generation_request": {
    "meta_data": {
      "tool": "NanoBanana Pro",
      "task_type": "photoreal_winter_snowfall_street_portrait",
      "priority": "highest",
      "language": "en"
    },
    "references": {
      "reference_image_style": {
        "source": "UPLOAD_REFERENCE_IMAGE (REQUIRED)",
        "purpose": "STYLE_COMPOSITION_LIGHTING_ANCHOR_ONLY",
        "strict_lock": true,
        "affect_face": false,
        "preserve_pose": true,
        "preserve_composition": true,
        "preserve_palette": true,
        "preserve_lighting": true,
        "preserve_vibe": true
      }
    },
    "global_constraints": {
      "rating": "PG-13",
      "no_nudity": true,
      "no_explicit_sexual_content": true,
      "no_logos": true,
      "no_watermark": true,
      "no_readable_text": true
    },
    "output_settings": {
      "aspect_ratio": "9:16",
      "orientation": "portrait",
      "resolution_target": "ultra_high_res",
      "render_style": "cinematic_photoreal_editorial",
      "sharpness": "crisp_but_natural",
      "film_grain": "subtle_35mm",
      "color_grade": "cold_winter_whites_soft_gray_blue_red_accent",
      "dynamic_range": "natural_not_hdr",
      "skin_rendering": "real_texture_zero_retouch"
    },
    "creative_prompt": {
      "scene_summary": "写实风格的冬季肖像，大雪纷飞。极简的雪景背景，伴有柔和的雾气和低对比度的冬季氛围。主体居中站立，直视镜头，表情平静略带忧郁。雪花和冰霜清晰可见地落在衣物和头发上。

主体：一名成年女性。面部特征柔和自然，无美颜滤镜，皮肤纹理真实。

服装：深色冬大衣（{argument name="coat color" default="black or charcoal"}），上面有明显的雪花。一条大胆的红色针织围巾（厚羊毛质感）缠绕在脖子上。一顶大胆的红色毛绒冬帽（仿皮草或毛绒），与围巾相配。红色配饰是整体柔和冬季色调中的主要色彩亮点。

细节：风吹乱的几缕头发拂过脸庞，湿润的睫毛，因寒冷而略带红晕的脸颊。多景深处逼真的雪花颗粒，电影般的浅景深。

光线：阴沉的冬季日光，柔和漫射，无强烈阴影，无 HDR。编辑级写实感，高细节。无文字。"
    },
    "negative_prompt": [
      "低分辨率",
      "面部扭曲",
      "AI 伪影",
      "美颜滤镜",
      "塑料皮肤",
      "过度平滑",
      "手部畸形",
      "多余手指",
      "身体扭曲",
      "红色过饱和",
      "霓虹红",
      "HDR",
      "卡通",
      "插画",
      "动漫",
      "标志",
      "文字",
      "水印",
      "模糊",
      "主体失焦"
    ]
  }
}
```

来源：https://x.com/astronomerozge1/status/2018758801361449217