Split Face Horror Transformation

Extreme close-up split-face horror portrait, {argument name="subject" default="young woman's face"} on left half pale and human with sharp dark eyes and blunt bangs, right half {argument name="transformation" default="transforming into monstrous demon jaw with rows of jagged fangs"}, torn skin revealing black void mouth, black and white high contrast photography, dramatic single-source rim lighting catching eye and teeth, thin red glowing thread cracks spreading across transformation seam, dark negative space background, unsettling direct eye contact, hyper-detailed skin texture, cinematic horror portrait, 9:16 vertical --ar 9:16 --v 6 (tighter crop, more aggressive):
Same concept but crop from hairline to chin only, teeth filling 40% of frame, single blood-red catchlight in the human eye, no background elements, maximum contrast, pure black negative space