Improve the lighting while keeping everything else exactly unchanged. Do not change the person, pose, expression, background, or composition. Fix problems such as backlighting, overly heavy shadows, underexposure, or uneven lighting. Adjust the original lighting to soft, natural, flattering light coming from slightly above eye level and directed toward the subject, so that the face is evenly lit and the skin tone is realistic and natural. Keep the result photorealistic and consistent with the original scene.