Transform the uploaded portrait into a high-contrast vector poster illustration.

Style requirements:
- Bold stencil / propaganda poster aesthetic
- Flat vector art
- 3–4 color palette only
- Solid red background
- Face rendered in grayscale tones (2–3 flat shadow layers)
- Black thick outer contour lines
- No gradients
- No texture
- No photorealism
- Sharp clean edges
- Posterized shading
- Centered head composition
- Minimal but strong facial features
- Graphic design style
- Adobe Illustrator vector look
- High contrast
- Smooth geometric shadow shapes

Output:
Crisp, clean, scalable vector-style portrait.