"Image1 is my reference face. Use it to replace only the entire head in Image 2. Scale and align my head naturally so it perfectly matches the body's proportions. Do not change the body at all. Keep the body size, shoulders, neck, chest, arms, muscles, pose, clothing, lighting, camera angle, background, and composition exactly the same. Keep my facial identity identical to Image 1, including hairstyle, hairline, eyebrows, facial shape, ears, skin tone, and all facial details. The only edit allowed is to replace and naturally fit my head onto the existing body. Everything else must remain unchanged."