Prompt : A candid vertical smartphone photo, NOT a professional photograph. Shot on an iPhone 15 main camera (26mm equivalent, f/1.78), ISO 2500, shutter 1/80s, with the phone's built-in flash fired. The photographer is standing on the running path holding the phone roughly at chest height, frame tilted approximately 3 degrees off-axis to the right. Aspect ratio 9:16 (vertical portrait). Subject distance approximately 2 meters, approaching the camera mid-stride.
SUBJECT: A 24-year-old Indonesian/Southeast Asian male runner, lean athletic build, around 173cm tall, average shoulders (not gym-bro physique). Mid-stride running pose — left foot lifted with motion blur on the toe and shoelaces, right foot planted, opposite arm forward. Mouth slightly open from breathing. Eyes focused forward but looking just past the right edge of the lens, NOT directly into the camera. Damp matted black hair, slightly messy fringe falling over forehead, wet at the hairline. Visible sweat beads at the temple. Skin texture clearly visible: open pores on the nose and cheeks, faint redness across the cheekbones and tip of the nose from cardiovascular exertion, slight 5 o'clock shadow on jawline, asymmetric facial features (one eye fractionally lower than the other, nose with a tiny natural deviation). The face must read as an ordinary guy, not a model — no chiseled jaw, no flawless skin, no styled hair.
OUTFIT: Charcoal grey technical running t-shirt, slightly oversized fit, with visible dark sweat patches on the chest center, both armpits, and a vertical strip down the sternum. The fabric clings irregularly where wet. Black running shorts, mid-thigh length, with a small visible drawstring loop. White running shoes, scuffed at the toe box, slight grey grime on the outsole. No visible logos. The lifted shoe shows motion blur.
LIGHTING: Mixed sources creating realistic uneven exposure. Frontal phone flash creates a hot highlight on the forehead, bridge of nose, upper cheekbones, and the sternum area of the t-shirt, with a hard-edged dark shadow falling backward and slightly to the right onto the running track. Stadium floodlights overhead cast cool 5500K ambient on the wider scene. Background is slightly underexposed — visible but muted. Warm tungsten glow (~3000K) from food vendor carts on the left edge of frame. Subtle magenta-green cast in the deep shadows from phone auto-white-balance struggling with the mixed sources.
ENVIRONMENT: Stadion Utama Gelora Bung Karno (GBK), Jakarta, around 8:30pm on a humid weeknight. The iconic curved white concrete stadium structure looms in the upper-right background, partially illuminated by its own perimeter lighting. Tropical trees with dense dark foliage frame the upper-left edge of the frame, slightly out of focus. The foreground surface is reddish-brown rubberized running track transitioning to grey asphalt — visible texture, small scattered dark patches, faint moisture sheen suggesting tropical humidity. The Jakarta CBD skyline sits far in the background — high-rise silhouettes with scattered lit windows in warm and cool tones, one or two with pale blue accent lighting.
BACKGROUND FIGURES (out of focus, never the main subject, all DIFFERENT from each other):
- Two other runners in the mid-distance, one in a white tee and one in a yellow tee, mid-stride, varying heights and builds
- One cyclist passing on the right side with a small red rear blinker light clearly visible
- One gerobak (Indonesian street food cart) on the far left with a red-and-yellow striped umbrella, vendor's silhouette barely visible underneath, small warm bulb illuminating the cart interior
- A few static bystanders in the deep background, none facing the camera
CAMERA AUTHENTICITY DETAILS (essential):
- Selective motion blur: only the runner's lifted foot and trailing forearm are slightly blurred. Face, torso, and front foot are sharp.
- Visible high-ISO grain in the darker areas of the frame (shadows on the track, the night sky, the tree foliage)
- Subtle chromatic aberration (faint red/cyan fringing) on high-contrast edges, especially around the bright stadium lights and skyline windows
- Mild barrel distortion typical of a phone wide-angle lens — vertical lines at the frame edges bow outward very slightly
- Flash falloff: subject brightly lit, falling off rapidly into the background within 3 meters
- Imperfect framing: subject is not perfectly centered, top of the head almost touches the upper edge but doesn't crop, lifted foot is close to the bottom edge
- Overall image energy is "grabbed snapshot by a friend," not "composed photograph"
EXPLICITLY AVOID:
- Cinematic, DSLR, mirrorless, or professional camera lighting quality
- Symmetric bokeh, beautifully rendered backgrounds, or smooth shallow cinematic depth of field
- Glowing, glistening, or "wet look" skin — sweat must read as real sweat (matte, irregular streaks, visible texture)
- Posed or modeling expressions (no smirking, no flexing, no direct lens eye contact, no gym selfie energy)
- Even, flat illumination — the lighting MUST be uneven with a visible flash hotspot and dark falloff
- Clean fashion outfits — clothes must look used, lightly wrinkled, sweat-marked
- Repeated, twinned, or copy-pasted background humans
- Any AI artifacts: extra fingers, fused limbs, distorted text on signage, melted shoe geometry, garbled or asymmetric ear/eye features
- Watermarks, recognizable brand logos
- Magazine-cover or movie-still composition
- Over-saturated colors — Jakarta night should look slightly muted, with subtle humidity haze in the deep background
- Any "AI photo" tells: plastic skin, perfect symmetry, dreamy ambient glow, weirdly clean reflections
The result must be a single vertical 9:16 photograph that, if posted to X or Instagram with no caption, would be assumed to be a real candid phone snap from a friend's GBK running session.