Photorealistic Celebrity Encounter Selfie with Controlled Expression

A highly constrained JSON prompt for Gemini Nano Banana Pro designed to generate a photorealistic selfie with a celebrity (implied, but the focus is on the foreground subject). The prompt enforces strict realism constraints and specifies a 'Calm confidence' expression, actively avoiding exaggerated excitement or surprise to achieve an 'Effortless, grounded, cool' aesthetic, typical of a controlled social media post.

{
  "metadata": {
    "prompt_version": "1.1.1",
    "generation_goal": "Photorealistic, believable celebrity encounter selfie",
    "determinism": {
      "pose_lock": true,
      "camera_lock": true,
      "anatomy_lock": true,
      "composition_lock": true,
      "perspective_lock": true
    },
    "realism_constraints": {
      "no_cartoony_proportions": true,
      "no_exaggerated_limb_length": true,
      "no_fisheye_distortion": true
    }
  },
  "subjects": [
    {
      "role": "Foreground subject",
      "description": {
        "gender_presentation": "Female-presenting",
        "expression": {
          "facial_emotion": "{argument name="facial emotion" default="Calm confidence"}",
          "details": {
            "eyes": "Relaxed, steady gaze toward the phone screen, lids naturally lowered",
            "eyebrows": "Neutral position, no exaggerated lift or tension",
            "mouth": "Soft, closed-lip smile or very slight parting, controlled and effortless",
            "jaw": "Relaxed with subtle definition, no tension"
          },
          "vibe": "Casual, self-assured, socially fluent — comfortable around celebrities",
          "avoid": [
            "Wide eyes",
            "Open-mouth excitement",
            "Raised eyebrows",
            "Overt surprise expressions"
          ]
        },
        "body_language": {
          "posture": "Upright but relaxed, shoulders loose",
          "energy": "Unbothered, composed, intentional",
          "intent": "Posing casually, as if this is a normal social moment"
        }
      }
    }
  ],
  "mood": "Effortless, grounded, cool, unmistakably real"
}

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