Act as a world-class photo retoucher specializing in fine art b&w.

Transform the supplied portrait image for professional billboard usage.

Inputs:
- Desired mood: [MOOD]
- Color palette: [PALETTE]
- Lighting style: [LIGHTING]
- Visual reference: [REFERENCE]
- Realism level: [REALISTIC/STYLIZED]

Provide:
- Step-by-step editing workflow
- Color grading recommendations
- Retouching techniques
- Composition improvements
- Export settings
- Final visual direction summary