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[Subject] One adult female singer (mid-20s), blonde shoulder-length loose waves, light skin, natural glam makeup, performing into a stage microphone while playing acoustic guitar. Expression is concentrated and intimate, lips slightly open mid-lyric, eyes directed downward-left toward mic. No glasses, no hat, minimal earrings.

[Environment] Dark indoor live-performance setting with warm stage spotlights in the background. Background contains soft circular/flare-like light blooms and no visible audience detail. Studio-concert hybrid ambiance.

[Composition/Camera] Vertical 9:16 format, medium close shot from upper torso to above head. Microphone stand enters from left and points directly to lips. Acoustic guitar occupies lower foreground with visible body curve and fretboard edge. Subject centered slightly right-of-center, shallow depth, clean separation from background.

[Lighting] Warm key light from front-left, soft diffusion on face and shoulder. Strong back practicals create glowing halo points behind subject. Balanced highlight on cheekbone, nose bridge, and collarbone; controlled shadow beneath jaw and neck.

[Clothing & materials] Black spaghetti-strap V-neck dress/top, smooth satin-like matte finish with subtle sheen on folds. Acoustic guitar with natural wood top and dark strings. Black microphone stand with silver mesh mic head.

[Color palette] Dominant colors: black, warm gold, skin peach, wood brown. Accent: muted steel gray in microphone hardware. Medium-high contrast with warm stage mood.

[Style/Rendering] Photoreal editorial concert portrait, high-detail skin texture and hair strands, clean digital image, no text overlay, no heavy grain, subtle cinematic highlight roll-off.

[Detail constraints] Keep exactly one female performer, one microphone, one acoustic guitar. Keep black thin-strap wardrobe and warm back spotlights. No caption text, no logos, no additional instruments, no crowd foreground.

Negative prompt: subtitle text, watermarks, logos, extra performers, backup band, piano, drum kit, audience closeups, anime style, painterly effect, plastic CGI skin, deformed hands, extra fingers, incorrect guitar proportions, extreme blur, oversharpening halos, neon nightclub color cast.

Suggested parameters: 9:16 aspect ratio; lens look 85mm (acceptable 65-105mm); aperture f/2.0-f/2.8 look; steps 30-38; CFG 5-7; sampler DPM++ 2M Karras; seed suggestion 338417.

Delta prompt strategy (top drift risks + corrective micro-prompts):
1) Subtitle leakage -> "clean frame with no on-screen text or lyric captions".
2) Extra performers -> "single singer only, no duet partner, no audience faces".
3) Mic mismatch -> "silver mesh vocal microphone on black stand from left side".
4) Guitar drift -> "natural wood acoustic guitar visible across lower frame".
5) Lighting flattening -> "warm key + bright soft stage backlights with shallow bokeh".
6) Outfit drift -> "black spaghetti-strap V-neck top, minimal styling".
7) Facial expression drift -> "focused intimate singing expression, lips slightly parted".
8) Camera crop drift -> "medium close-up portrait, subject fills about 70% frame".
9) Texture over-smoothing -> "retain natural skin pores and realistic hair strands".
10) Color imbalance -> "warm gold lighting with neutral dark background, no neon tint".