Nano Banana 2 Image Generation Master

Nano Banana 2 Image Generation Master

Goal

The purpose of this skill is to provide a standardized, highly controlled method for generating images using AI model Nano Banana 2 (or any underlying model connected to the generate_image tool). By strictly enforcing a structured JSON parameter schema, this skill neutralizes native model biases (like over-smoothing, dataset-averaging, or "plastic" AI styling) and ensures raw, unretouched, hyper-realistic outputs.

Prerequisites

• fal.ai API key (FAL_KEY in .env) — sign up at https://fal.ai (free tier, Nano Banana 2 model)
• OR Euri API key (EURI_API_KEY in .env) — free for Euron students at https://euron.one/euri
• A clear understanding of the user's desired Subject, Lighting, and Camera characteristics.

Core Schema Structure

When constructing a prompt for the generate_image tool, you MUST use the following JSON schema as the foundation. Fill in the string values with extreme, microscopic detail.

{
  "task": "string - High-level goal (e.g., 'sports_selfie_collage', 'single_macro_portrait')",
  
  "output": {
    "type": "string - e.g., 'single_image', '4-panel_collage'",
    "layout": "string - e.g., '1x1', '2x2_grid', 'side-by-side'",
    "aspect_ratio": "string - e.g., '3:4', '16:9', '4:5'",
    "resolution": "string - e.g., 'ultra_high', 'medium_low'",
    "camera_style": "string - e.g., 'smartphone_front_camera', 'professional_dslr'"
  },

  "image_quality_simulation": {
    "sharpness": "string - e.g., 'tack_sharp', 'slightly_soft_edges'",
    "noise": "string - e.g., 'unfiltered_sensor_grain', 'visible_film_grain', 'clean_digital'",
    "compression_artifacts": "boolean - true if attempting to simulate uploaded UGC",
    "dynamic_range": "string - e.g., 'limited', 'hdr_capable'",
    "white_balance": "string - e.g., 'slightly_warm', 'cool_fluorescent'",
    "lens_imperfections": [
      "array of strings - e.g., 'subtle chromatic aberration', 'minor lens distortion', 'vignetting'"
    ]
  },

  "subject": {
    "type": "string - e.g., 'human_portrait', 'nature_macro', 'infographic_flatlay'",
    "human_details": {
      "//": "Use this block ONLY for human subjects",
      "identity": "string",
      "appearance": "string - Extremely specific (e.g., visible pores, mild redness)",
      "outfit": "string"
    },
    "object_or_nature_details": {
      "//": "Use this block for non-human subjects",
      "material_or_texture": "string - e.g., 'brushed aluminum', 'dew-covered velvety petals'",
      "wear_and_tear": "string - e.g., 'subtle scratches on the anodized finish', 'browning edges on leaves'",
      "typography": "string - e.g., 'clean sans-serif overlaid text, perfectly legible'"
    }
  },

  "multi_panel_layout": {
    "grid_panels": [
      {
        "panel": "string - e.g., 'top_left', 'full_frame' (if not a grid)",
        "pose": "string - e.g., 'slight upward selfie angle, relaxed smile'",
        "action": "string - e.g., 'holding phone with one hand, casual posture'"
      }
    ]
  },

  "environment": {
    "location": "string - e.g., 'gym or outdoor sports area'",
    "background": "string - What is behind the subject (e.g., 'blurred gym equipment')",
    "lighting": {
      "type": "string - e.g., 'natural or overhead gym lighting', 'harsh direct sunlight'",
      "quality": "string - e.g., 'uneven, realistic, non-studio', 'high-contrast dramatic'"
    }
  },

  "embedded_text_and_overlays": {
    "text": "string (optional)",
    "location": "string (optional)"
  },

  "structural_preservation": {
    "preservation_rules": [
      "array of strings - e.g., 'Exact physical proportions must be preserved'"
    ]
  },

  "controlnet": {
    "pose_control": {
      "model_type": "string - e.g., 'DWPose'",
      "purpose": "string",
      "constraints": ["array of strings"],
      "recommended_weight": "number"
    },
    "depth_control": {
      "model_type": "string - e.g., 'ZoeDepth'",
      "purpose": "string",
      "constraints": ["array of strings"],
      "recommended_weight": "number"
    }
  },

  "explicit_restrictions": {
    "no_professional_retouching": "boolean - typically true for realism",
    "no_studio_lighting": "boolean - typically true for candid shots",
    "no_ai_beauty_filters": "boolean - mandatory true to avoid plastic look",
    "no_high_end_camera_look": "boolean - true if simulating smartphones"
  },

  "negative_prompt": {
    "forbidden_elements": [
      "array of strings - Massive list of 'AI style' blockers required for extreme realism. Example stack: 'anatomy normalization', 'body proportion averaging', 'dataset-average anatomy', 'wide-angle distortion not in reference', 'lens compression not in reference', 'cropping that removes volume', 'depth flattening', 'mirror selfies', 'reflections', 'beautification filters', 'skin smoothing', 'plastic skin', 'airbrushed texture', 'stylized realism', 'editorial fashion proportions', 'more realistic reinterpretation'"
    ]
  }
}