The recipe
The shot never describes the person. It describes what is happening to them, which is what keeps the face out of the variables.
Getting it right
Composed
The locked line comes from the character sheet; everything after it comes from the recipe above. Swap in your own line and nothing else changes.
Midjourney
Studio headshot of a woman, late twenties, South Asian features, an oval face, dark brown almond eyes, softly arched brows, a straight nose, evenly balanced lips, a scatter of freckles across the nose and cheeks, shoulder-length wavy dark brown hair with a centre part, golden skin, natural texture and visible pores, average height with an average build. Wearing plain unbranded basics, a warm neutral palette of sand, bone and camel, in a small modern city apartment, soft daylight from a large window, camera at eye level. Head and shoulders, centred, shot on a 105mm at f/5.6. Square to camera, chin level, neutral expression, direct eye contact. White seamless, large soft source front-left, subtle fill right --ar 4:5 --style raw --seed 2865404059 --cref [url of your approved reference frame] --cw 100
Flux
Studio headshot of a woman, late twenties, South Asian features, an oval face, dark brown almond eyes, softly arched brows, a straight nose, evenly balanced lips, a scatter of freckles across the nose and cheeks, shoulder-length wavy dark brown hair with a centre part, golden skin, natural texture and visible pores, average height with an average build. Wearing plain unbranded basics, a warm neutral palette of sand, bone and camel, in a small modern city apartment, soft daylight from a large window, camera at eye level. Head and shoulders, centred, shot on a 105mm at f/5.6. Square to camera, chin level, neutral expression, direct eye contact. White seamless, large soft source front-left, subtle fill right negative: beauty filter, airbrushed skin, plastic skin, waxy skin, over-smoothed, perfectly symmetrical face, extra fingers, malformed hands, warped jewellery, text artifacts, watermark, logo on clothing, duplicate person, changing facial structure, clear skin, freckles removed, poreless skin seed: 2865404059 | guidance: 3.5 | steps: 28
Seedream
Studio headshot of a woman, late twenties, South Asian features, an oval face, dark brown almond eyes, softly arched brows, a straight nose, evenly balanced lips, a scatter of freckles across the nose and cheeks, shoulder-length wavy dark brown hair with a centre part, golden skin, natural texture and visible pores, average height with an average build. Wearing plain unbranded basics, a warm neutral palette of sand, bone and camel, in a small modern city apartment, soft daylight from a large window, camera at eye level. Head and shoulders, centred, shot on a 105mm at f/5.6. Square to camera, chin level, neutral expression, direct eye contact. White seamless, large soft source front-left, subtle fill right Keep identical: a woman, late twenties, South Asian features, an oval face, dark brown almond eyes, softly arched brows, a straight nose, evenly balanced lips, a scatter of freckles across the nose and cheeks, shoulder-length wavy dark brown hair with a centre part, golden skin, natural texture and visible pores, average height with an average build Change only: [the one thing that changes in this shot]