伊斯坦布尔雪景下的电影级写实街头浪漫

```json
{
  "generation_request": {
    "meta_data": {
      "tool": "NanoBanana Pro",
      "task_type": "photoreal_candid_street_romance",
      "version": "v1.3_ISTANBUL_SNOW_SNOWMAN_LOVE_EN",
      "priority": "highest"
    },

    "output_settings": {
      "aspect_ratio": "4:5",
      "orientation": "portrait",
      "resolution_target": "ultra_high_res",
      "render_style": "ultra_photoreal_candid_street_film_still",
      "sharpness": "crisp_but_natural",
      "film_grain": "subtle_35mm",
      "color_grade": "true_to_life_winter_natural",
      "dynamic_range": "natural_not_hdr",
      "skin_rendering": "real_texture_no_retouch"
    },

    "global_rules": {
      "camera_language": "35mm 镜头等效焦距，平视视角，不完美的构图，纪实抓拍感，有人物时聚焦眼睛",
      "authenticity_markers": "雪地高光处有细微光晕，轻微的胶片门抖动，背景仅有轻微运动模糊，真实的冬季街景纹理，无影棚感",
      "lighting_language": "仅限自然光源（阴天雪景日光），深邃但细节丰富的阴影"
    },

    "creative_prompt": {
      "scene_summary": "{argument name=\"scene summary\" default=\"下雪天的伊斯坦布尔。一对二十出头的年轻情侣在雪中堆雪人。一个安静、真实的共享欢乐时刻——无需表演的爱。\"}",

      "subjects": {
        "count": 2,
        "description": "同一对年轻男女（二十出头），大学生，普通真实，非模特般；面部清晰可见，眼神锐利",
        "expression": "轻声笑语，专注，羞涩的幸福；克制而自然",
        "skin_and_face": "自然的皮肤纹理，脸颊因寒冷略显泛红，无美颜修饰，无塑料感皮肤"
      },

      "wardrobe_and_props": {
        "female": "中性色调的简约冬装外套，围巾随意地围着，手套因雪略湿，长发部分塞进外套里",
        "male": "深色冬装夹克，内搭针织毛衣，简约牛仔裤，手套拿在手里或戴着",
        "props": "他们之间堆了一半的雪人，雪花沾在袖子和头发上"
      },

      "micro_action": "他们一起滚雪，双手不经意地触碰；一人调整雪人的头部，另一人则在笑；雪花落在肩膀和睫毛上",

      "environment_details": {
        "location": "伊斯坦布尔街区街道或公园（{argument name=\"location vibe\" default=\"Moda / Kuzguncuk / 大学周边氛围\"}）",
        "background": "覆盖着薄雪的老公寓外墙，停放的汽车上覆盖着薄雪，光秃秃的树枝，远处几个行人被柔和地虚化",
        "ground_details": "脚下是新雪，不平整的脚印，人行道边缘有融雪的泥泞"
      },

      "lighting": "柔和的阴天冬季日光，被雪花漫射；柔和的对比度；明亮的雪面有细微光晕",

      "composition": "平视中景，略微偏离中心的构图，像真实街拍一样不完美的裁剪"
    }
  }
}
```