Smart professional ID photo, overall style referencing American ID photos, with the subject size being moderate. Use a subtle gray-to-white gradient photographic background, soft and natural lighting, highlighting realistic skin tone and layering. The image should be clear and high-quality, with the face in focus, transparent and good skin texture, and a comfortable, normal head-to-shoulder ratio. The overall temperament is modern and elegant, with a relaxed, naturally confident expression and bright, expressive eyes. Medium shot portrait, moderate subject size, centered subject, low contrast, presenting the refined quality of professional portrait photography. Suitable for business and professional headshots. Aspect ratio 3:4