How do I control lighting and shadows in my image?

Lighting is one of the most powerful prompt elements. Use specific lighting terms: 'soft diffused light' (gentle, even), 'dramatic Rembrandt lighting' (deep shadows, one strong source), 'golden hour' (warm, low-angle sunlight), 'studio lighting with softbox' (commercial, clean), 'neon light' (vibrant, colorful), 'backlit silhouette' (subject against bright background), 'overcast natural light' (soft outdoor). Specify shadow behavior: 'long shadows,' 'no harsh shadows,' 'deep contrast shadows.'