Photorealistic Portrait Background Replacement

Create a photorealistic portrait using the uploaded image as the reference. Keep the man's face, hairstyle, beard, body proportions, clothing, pose, and overall appearance unchanged. Replace the existing lake and mountain background with a sophisticated deep green and black gradient background, featuring subtle dark emerald tones, soft black shadows, cinematic depth, and a premium luxury atmosphere. Add gentle studio-style rim lighting around the subject, with soft green highlights along the edges of his hair and shoulders. Keep the subject sharply focused while the background remains smoothly blurred and atmospheric. High-end fashion editorial photography, realistic skin texture, natural lighting, dramatic contrast, elegant masculine aesthetic, 4K detail.