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 image into a retro aesthetic. Maintain the original facial structure, expression, and identity recognition throughout the transformation.

TRANSFORMATION DESCRIPTION:
Convert the photo to a vintage retro style with authentic period-appropriate aesthetics. Apply film grain texture, slightly faded color palette, and soft focus characteristic of older photography equipment. The image should evoke the nostalgic feel of photographs from the 1970s-1990s era, with warm sepia or muted color tones, gentle light leaks, and authentic vintage imperfections that look natural and artistic rather than artificially applied.

STYLE AND AESTHETIC PARAMETERS:
- Art style: Photorealistic vintage photography with authentic film characteristics
- Lighting: Soft, slightly diffused lighting with warm golden hour tones or subtle indoor tungsten warmth
- Color palette: Muted tones, warm sepia undertones, faded saturation, subtle color shifts typical of aged film
- Background: Keep original background but apply vintage color grading and soft focus; optional subtle vignetting
- Texture: Visible but subtle film grain, gentle scratches or dust particles for authenticity
- Mood: Nostalgic, timeless, warm, artistic
- Era: 1970s-1990s vintage photography aesthetic

TECHNICAL QUALITY PARAMETERS:
- High resolution, 4K, detailed
- Sharp focus on face (maintaining facial clarity despite vintage styling)
- Professional quality portrait
- Aspect ratio: 4:3 (classic photo ratio) or 1:1 (square format)
- Authentic film simulation without over-processing
- Natural skin texture preserved beneath vintage grading

NEGATIVE PROMPT GUIDANCE:
Avoid: distorted facial features, unrealistic proportions, blurry face, loss of likeness, over-saturated colors, modern digital filters, plastic skin appearance, unnatural color grading, excessive noise, pixelation, low resolution, cartoonish effects, unrealistic vintage effects that break identity recognition

USER CUSTOMIZATION:
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ADDITIONAL GUIDANCE:
For best results, specify your preferred retro era in the customization section. Options include: 1970s Kodachrome film style (warm, saturated but aged), 1980s faded polaroid (muted pastels, soft contrast), or 1990s disposable camera (cooler tones, slight flash reflection). The transformation should feel authentic to the chosen era while keeping your facial identity completely intact and recognizable.