IDENTITY PRESERVATION INSTRUCTION:
Using the uploaded photo as reference, preserve the person's exact facial features, face shape, eye color, skin tone, and unique characteristics while transforming the time of day. The person's identity must remain completely recognizable with no changes to their facial structure, expressions, or physical appearance. Maintain the original pose, composition, and subject positioning.

TRANSFORMATION DESCRIPTION:
Change the time of day in the photo to [desired time: golden hour sunset / bright midday / twilight blue hour / night time with artificial lighting]. The lighting should be completely reimagined to match the selected time period while keeping the person's appearance natural under the new lighting conditions. The sky, ambient light, shadows, and color temperature must reflect the chosen time of day authentically.

For sunset/golden hour: Warm orange and golden tones, long dramatic shadows, soft directional light from the side, golden rim lighting on hair and shoulders, warm atmospheric haze.

For bright daylight: Crisp clear lighting, bright natural light, cool to neutral color temperature, minimal shadows or soft diffused shadows, blue sky with possible clouds, high contrast but natural.

For twilight/blue hour: Cool blue and purple tones, soft ambient light, minimal shadows, magical atmospheric glow, balanced light with hints of warm artificial sources if present.

For night time: Dark moody atmosphere with artificial lighting sources (streetlights, neon, warm windows), cool shadows with warm light accents, atmospheric glow from light sources, possible bokeh effects from lights.

STYLE AND AESTHETIC PARAMETERS:
- Photorealistic quality with natural skin texture preservation
- Cinematic lighting that matches the chosen time period
- Color grading specific to the time of day (warm for sunset, cool for night, etc.)
- Atmospheric perspective and depth appropriate to lighting conditions
- Natural light falloff and realistic shadow behavior on face and body
- Sky and environmental lighting should be seamless and believable
- No artificial-looking filters or oversaturated colors
- Professional photography style with natural depth of field

TECHNICAL QUALITY PARAMETERS:
- High resolution, 4K, detailed
- Sharp focus on face and facial features
- Professional quality cinematic portrait
- Natural skin texture and pores visible
- Realistic lighting on skin surface
- Consistent lighting direction across the entire image
- No visible artifacts or AI generation errors
- Aspect ratio should match original photo or 4:5 for portraits

NEGATIVE PROMPT GUIDANCE:
Avoid: distorted facial features, unrealistic skin tones, mismatched lighting on face and background, blurry face, loss of facial likeness, unnatural color casting on skin, artificial-looking sky, inconsistent lighting direction, oversaturated colors, unrealistic shadows, garish colors, plastic-looking skin, loss of detail in facial features, unnatural contrast

USER CUSTOMIZATION:
{additional_context}

EXAMPLE USAGE:
Replace [desired time] with your preference: "golden hour sunset" for warm evening light, "bright midday" for clear daylight, "twilight blue hour" for cool magical atmosphere, or "night time" for moody artificial lighting scenes. You can also specify additional preferences like "sunset with dramatic clouds" or "night with neon lighting" in the {additional_context} section.