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 overall mood and expression.

TRANSFORMATION DESCRIPTION:
Transform the subject into their dark, evil alter ego. Maintain the original facial structure and identity but introduce menacing visual elements: subtle changes to the facial expression (e.g., a sinister smirk, narrowed eyes, or intense gaze), darker and more dramatic lighting that creates strong shadows across the face, and an atmosphere of mystery and power. The transformation should feel like a natural but sinister evolution of the person, not a different individual.

STYLE AND AESTHETIC PARAMETERS:
- Art style: Photorealistic cinematic portrait with high contrast
- Lighting conditions: Dramatic chiaroscuro lighting, deep shadows, rim lighting to create a halo effect around the silhouette
- Color palette: Cool, desaturated tones with deep blacks and muted highlights; subtle hints of dark crimson or deep purple in the shadows
- Background treatment: Dark, atmospheric background (e.g., shadowy room, stormy sky, or abstract dark void) that doesn't distract from the face
- Facial expression: Intense, confident, and slightly menacing; eyes should be sharp and focused
- Attire: Suggest dark, elegant clothing (e.g., dark suit, leather jacket, or cloak) that complements the sinister aesthetic

TECHNICAL QUALITY PARAMETERS:
- High resolution, 4K, detailed
- Sharp focus on face with perfect facial feature retention
- Professional quality portrait
- Aspect ratio: 1:1 (square) for best face detail preservation
- Natural skin texture maintained with enhanced dramatic shadows
- Cinematic depth of field with background slightly blurred

NEGATIVE PROMPT GUIDANCE:
Avoid: distorted facial features, unrealistic proportions, blurry face, loss of likeness, unnatural skin textures, over-saturated colors, cartoonish appearance, deformed eyes, asymmetrical face, unnatural lighting, excessive digital artifacts, low resolution, pixelation, blurry background, text, watermarks, multiple subjects, extra limbs

USER CUSTOMIZATION:
{additional_context}

ADDITIONAL TIPS:
- For stronger effect, add keywords like 'cinematic', 'film noir', 'dramatic', 'high contrast'
- To preserve specific facial features, mention them in additional_context (e.g., 'preserve the scar on left cheek' or 'keep the glasses')
- The prompt works best with clear, well-lit source photos