Ink Behind You: keep the person real, sketch the world

Use case: identity-preserve
Input images: the attached image: a photo containing one adult person
Primary request: Keep the person in the attached image fully photorealistic and naturally colored, but transform the entire background into a detailed black-and-white graphite pencil sketch.
Identity and subject invariants: preserve the recognizable face, skin tone, hair, expression, body proportions, pose, clothing, and any object the person is actively holding or using. Keep those protected elements crisp, photographic, and in their original colors.
Background treatment: redraw every unprotected background element as monochrome linework on white paper, with convincing contour lines, cross-hatching, graphite shading, and subtle construction marks. No color may remain in the background.
Edge treatment: create a precise separation around hair, clothing, fingers, legs, and protected objects; prevent sketch texture or grayscale spill from crossing onto the person.
Composition/framing: preserve the original crop, camera angle, perspective, and subject placement.
Constraints: change only the background medium; do not add or remove scene elements; no border, text, logos, or watermarks.