Nano Banana prompt: { "prompt_type": "descriptive_replication", "r...
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Model used
Nano Banananano-banana-proGeneration parameters
Image2286x4096jpg
Prompt
{
"prompt_type": "descriptive_replication",
"reference_adherence": "STRICT_VISUAL_FIDELITY",
"aspect_ratio": "3:4",
"camera_override": {
"framing": "medium shot from navel upward",
"subject_scale": "subject close to camera, face dominant in frame",
"pose_alignment": "body and head fully frontal, symmetrical, square to camera",
"distance": "approx. 1.5 meters",
"face_priority": "very high"
},
"expression_block": {
"emotion_type": "joyful laughter",
"smile_style": "Hollywood smile, wide and confident",
"teeth_visibility": "upper teeth fully visible, lower teeth partially visible",
"lip_behavior": "natural stretch without distortion of identity ratios",
"lower_to_upper_ratio_preserved": true,
"cheek_activation": "zygomaticus major fully engaged creating lifted cheeks",
"eye_expression": "slight natural narrowing from smiling, subtle crow's feet micro-lines allowed",
"brow_behavior": "relaxed, no exaggerated lifting",
"jaw_opening": "moderate, natural laugh opening (~35-45%)",
"emotion_intensity": "genuine, not forced",
"symmetry": "high but with natural micro-asymmetry"
},
"micro_expression_details": {
"nasolabial_folds": "softly pronounced during smile",
"dimples": "subtle if anatomically consistent",
"lip_corner_lift": "strong upward curvature",
"orbicularis_oculi_engagement": "moderate, authentic Duchenne smile",
"chin_skin_tension": "slight tightening during laughter"
},
"body_language": {
"posture": "upright and relaxed",
"shoulders": "stable, slightly back",
"chest": "natural rise from laughter breath",
"head_position": "centered, no tilt",
"movement": "minimal, static pose while smiling"
},
"lighting_and_atmosphere": {
"source": "on-camera flash + natural backlight",
"flash_effect": "strong frontal illumination, specular highlights on teeth and cheekbones",
"background": "dark underexposed foliage",
"contrast": "very high",
"grain": "visible digital grain",
"color_profile": "slightly desaturated, early compact camera aesthetic"
},
"realism_constraints": {
"preserve_identity": true,
"preserve_craniofacial_geometry": true,
"allow_natural_smile_wrinkles": true,
"forbid_face_warping": true,
"forbid_exaggerated_cartoon_smile": true,
"forbid_plastic_skin": true
},
"negative_prompt": [
"forced smile",
"fake grin",
"overstretched lips",
"cartoon smile",
"CGI teeth",
"perfect dental symmetry",
"identity drift",
"beauty filter",
"over-smoothed skin",
"anime",
"3D render",
"visible ears",
"wide angle distortion",
"knees visible",
"full body shot"
]
}
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