{"subject": {"description": "A model rock climber seen from behind in a gym, arms extended straight out to both sides while holding cable handles, with prominently defined upper-back muscles and scapula natural features under low-key lighting. It looks powerful", "mirror_rules": null, "age": "20", "expression": {"eyes": {"look": null, "energy": "focused", "direction": null}, "mouth": {"position": null, "energy": null}, "overall": "focused mid-rep, face turned away"}, "face": {"preserve_original": true, "makeup": null}, "hair": {hair, "style": "low styled hair through a dark baseball cap", "effect": "a few loose strands"}, "body": {"frame": "lean athletic, narrow base, lean muscle", "waist": "The super-slim waist accentuates the broad shoulders.", "chest": null, "legs": "covered by loose pants", "skin": {"visible_areas": ["back", "generous shoulders", "arms"], "tone": "pale, white, cool-toned ", "texture": "natural skin texture with slight workout sheen", "lighting_effect": "low-key cool highlights defining lats, traps, rear delts, and scapula grooves"}}, "pose": {"position": "standing, back to camera", "base": "stable stance, Lean your upper body slightly forward", "overall": "both arms fully extended horizontally, holding cable handles in each hand，Starting to do exercises to train chest muscles"}, "clothing": {"top": {"type": "string-strap fitted athletic top", hair, "details": "ultra-thin round elastic cord straps, strap width must be 0.1cm or thinner; cord-like and round (not flat webbing). Two ultra-thin(width must be 0.1cm) cords form a clean X across the upper back, plus one lower diagonal cord creating a small angled triangle into a thin back band.", "effect": "delicate thin-string geometry framing the back muscles, The thin elastic bands almost completely his back, making him look both powerful and commanding."}, "bottom": {"type": "loose sweatpants", "color": "medium gray", "details": "relaxed fit with a lighter waistband showing above", "effect": "casual training look"}}, "accessories": {"headwear": "dark baseball cap", "jewelry": null, "device": null, "prop": "cable machine handles held in both hands"}, "photography": {"camera_style": "realistic cinematic gym fitness photography", "angle": "rear view at about shoulder height, slight telephoto compression", "shot_type": "mid-to-full body from head to upper , centered subject", "aspect_ratio": "4:5 vertical", "texture": "crisp subject detail with soft background bokeh, subtle micro-contrast on muscles (not harsh global sharpening)", "lighting": "premium low-key lighting, dim overall; cool light on the subject with controlled highlights and deeper shadows; warm background bokeh points", "depth_of_field": "shallow depth of field, background strongly blurred"}, "background": {"setting": "indoor gym with dumbbell area and machines, glass/mirror partitions", "wall_color": "cool gray and dark tones", "elements": ["dumbbell racks", "gym machines", "glass or mirror panels", "warm circular bokeh lights"], "atmosphere": "quiet, serious training vibe", "lighting": "dim ambient with warm bokeh in the distance"}, "the_vibe": {"energy": "disciplined, strong", "mood": "moody and focused", "aesthetic": "high-end low-key gym portrait, realistic social media look", "authenticity": "candid mid-set moment", "intimacy": "observational back view", "story": "captured during a cable movement emphasizing back and shoulders", "caption_energy": "minimal and confident"}, "constraints": {"must_keep": ["back view only", "arms extended horizontally holding cable handles", "pale cool-toned skin", "prominent back muscle definition via low-key lighting", "straps must be round cord-like and extremely thin", "strap width must be 0.1 cm (1 mm) or thinner", "strap layout: clean X on upper back plus a lower diagonal/triangular cord into the back band", "dark baseball cap, dark low styled hair", "gray loose sweatpants with lighter waistband", "warm bokeh lights in background", "shallow depth of field, subject sharp background blurred", "4:5 vertical framing"], "avoid": ["straps wider than 0.5 cm", "flat webbing or ribbon straps", "thick fitted athletic top bands", "extra random straps", "flat bright lighting", "harsh global sharpening", " logos or readable text"]}, "negative_prompt": ["straps wider than 0.5 cm", "wide straps", "flat straps", "ribbon straps", "webbing straps", "thick bands", "padded athletic top", "extra random straps", "overexposed", "heavy HDR", "harsh sharpening", "cartoon", "anime", " logos", "readable text", "distorted anatomy", "busy sharp background"]}}