IDENTITY PRESERVATION INSTRUCTION:
Using the uploaded black and white photo as the primary reference, you MUST preserve the person's exact facial features, face shape, eye shape, skin structure, and all unique identifying characteristics. The identity and likeness must remain 100% accurate to the original subject. Do not alter facial geometry or distinctive marks.

TRANSFORMATION DESCRIPTION:
Colorize this black and white photograph with natural, realistic, and historically accurate colors. Apply authentic skin tones appropriate to the lighting and era, realistic hair color, and plausible clothing colors. The colorization should look organic and seamless, as if the photo was originally shot in color. Enhance the image quality while maintaining the original composition and character.

STYLE AND AESTHETIC PARAMETERS:
- Art style: Photorealistic restoration with natural color grading
- Lighting: Preserve original lighting conditions; add subtle warmth to highlights and cool tones to shadows
- Color palette: Natural skin tones (avoid oversaturation), authentic period-appropriate clothing colors, soft environmental colors
- Texture: Maintain original grain and texture for authenticity, enhance clarity
- Background: Colorize background with muted, natural tones to keep focus on the subject
- Mood: Authentic, warm, nostalgic, professional restoration quality

TECHNICAL QUALITY PARAMETERS:
- High resolution, 4K, detailed
- Sharp focus on face and key features
- Professional quality restoration
- Natural skin texture preserved with realistic pores and tones
- Color consistency across the entire image
- No artifacts or color bleeding
- Recommended aspect ratio: [1:1 for portraits, 4:3 for group photos, or match original]

NEGATIVE PROMPT GUIDANCE:
Avoid: Oversaturated colors, unrealistic skin tones, color bleeding outside boundaries, distorted facial features, blurry face, loss of likeness, unnatural color distribution, cartoonish appearance, inconsistent lighting, artifacts, low resolution, unnatural gradients

USER CUSTOMIZATION:
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Additional Tips:
- For specific era reference, mention it in additional context (e.g., "1950s Kodachrome style", "Victorian era palette")
- If you want specific colors for clothing or hair, specify them in additional context
- For artistic effects, request specific color grading preferences