an 18-year-old girl, a soft black semi-transparent silk on her lower face, alone in an underground subterranean river, both Arms extending naturally from the foreground toward the middle ground, one arm fully extended along a natural stone ledge besIDE the underground river, the SECond arm extending in the Same direction and resting naturally on top of the first arm, both arms predominantly strAIght with elbows not noticeably bent, no folded arms, no crossed arms, relaxed natural posture, she leaning forward comfortably with her head resting above her extended arms, body concealed behind the stone ledge, natural anatomy and proportions, minimal foreshortening, no exaggerated perspective, slow-flowing underground river, faint ambient illumination, subtle mist and moisture in the air, hyper-realistic wet skin sheen, subtly glistening skin, Realism style, cinematic medium-long shot, slightly high-angle, cinematic low-key lighting with intentional underexposure, strong backlight separation, deep shadows preserving low visibility in the facial lower region, volumetric haze visible in light paths, low digital noise, minimal grain, clean PBR materials, high signal-to-noise ratio. side front view, vertical 3:4 composition.