nanobanana prompt: K-pop Idols on a Train: Cinematic Group Portrait with Natural Lighting

{
  "prompt": "Three K-pop idols sitting on a train. Left girl is Rosé with pale skin and long blonde hair, looking at a phone. Middle girl is Tzuyu with warm fair skin and dark brown hair, sleeping, making a peace sign. Right girl is Karina with sharp facial features and long dark hair, sleeping, wearing a navy vest. Uniforms: white shirts, navy plaid skirts, bow ties. Train window background. --ar 3:4",
  "aspect_ratio": "3:4",
  "subjects": [
    {
      "position": "left",
      "identity": "Rosé",
      "physical_characteristics": "slender face, pale skin, long straight blonde hair, soft monolid eyes, petite build",
      "pose": "looking down, holding phone",
      "outfit": "white cotton long-sleeve shirt, navy/white plaid pleated skirt, navy striped bow tie",
      "items": "smartphone"
    },
    {
      "position": "middle",
      "identity": "Tzuyu",
      "physical_characteristics": "elegant features, warm fair skin, large doe eyes, long dark brown wavy hair, tall build",
      "pose": "head tilted left, eyes closed, right hand making peace sign",
      "outfit": "white cotton long-sleeve shirt, navy/white plaid pleated skirt, navy striped bow tie"
    },
    {
      "position": "right",
      "identity": "Karina",
      "physical_characteristics": "sharp V-line jaw, small face, fair skin, long straight dark black hair, AI-like flawless features",
      "pose": "head tilted right, eyes closed, resting, legs crossed",
      "outfit": "white cotton shirt, navy knit vest, navy/white plaid pleated skirt, navy striped bow tie, black patent leather loafers"
    }
  ],
  "background": {
    "setting": "Train interior",
    "details": "Black ribbed seat, window showing daytime suburban houses and power lines."
  },
  "color_grading": {
    "style": "Natural daylight, slightly muted, soft contrast",
    "lighting": "Backlit from window, diffuse interior fill"
  },
  "color_palette": {
    "navy_blue": "#1C2841",
    "white": "#F0F0F0",
    "plaid_grey": "#5A6A7A",
    "skin_tone_pale": "#F3E3D3",
    "skin_tone_warm": "#EACCA9",
    "hair_blonde": "#E8D3A2",
    "hair_dark": "#1A1A1A",
    "shoe_black": "#050505"
  }
}