{
"subject": "The face of a baby still in the womb, the way a 3D ultrasound shows the relief, but with real skin in place of the grain of the scan. A large, completely bald head, a high domed forehead, very full rounded cheeks, a small upturned nose with the tip lifted, full lips closed in a slight pout, a small receding chin, a small soft ear tucked against the head. The eyelids are closed, full and a little swollen, each one marked by a fine crease; the eyebrows are almost invisible and there is not a single strand of hair. Mandatory preservation when a scan is uploaded: the line of the profile in the uploaded image is the line of this image. Copy the same line of the forehead, the bridge of the nose, the tip of the nose, the curve of the upper lip, the lower lip and the chin, the same tilt of the head, the same three-quarter angle and the same position of the little hand. Only the MATERIAL changes: the grey-yellow grain of the scan becomes skin. Do not open the eyes, do not add hair, do not slim the cheek, do not reshape the head and do not invent any feature the scan does not show.",
"action": "The baby is at rest, with a closed little hand against the cheek, just below the mouth, the short plump fingers curled in and the nails small and soft. The forearm runs diagonally down across the chest. No movement, no gesture and no other hand in the frame.",
"scene": "The baby floats in a warm gloom, with no floor, no wall and no object around. The background is a dark reddish amber that darkens steadily towards the edges of the frame, completely smooth: no particles, no grain, no frame, no cord and no fabric.",
"composition": "A vertical portrait in 3:4 proportion. The framing runs from the top of the head down to the shoulder. The top of the head sits at about 7% of the height of the frame and the chin at around 60% of the height, so that the head alone takes more than half the image, which is the real proportion of a baby. The face is centred and a little to the left, turned at three quarters towards the viewer's left, and the shoulder comes in at the bottom edge.",
"camera": "Camera at face height, straight on, a short portrait distance, the look of an 85mm lens wide open. Shallow depth of field: the eyelids and the lips are the sharpest point, the ear already softens and the background dissolves completely.",
"lighting": "A single large diffuse source from above and from the left, like a veiled window. The left side of the face is bright, the nape and the ear fall into shadow and a thin warm rim light draws the edge of the forehead, the nose and the chin. No hard flash, no cut-out shadow and no second light source.",
"color_palette": "Amber, peach and dark reddish brown, from bright on the face to nearly black at the edges. Low saturation and a warm cast across the whole image: no blue, no green and no cold grey anywhere, because the cold tone is exactly what gives away that the image is still a scan.",
"style": "Newborn studio photography, realistic and delicate, an atmosphere of calm and quiet. No illustration, no 3D rendering and no plastic retouching.",
"materials": "Real baby skin, soft and slightly translucent, with almost invisible pores and a very fine down catching the light at the edge of the cheek and the forehead. No plaster, wax, porcelain or clay surface, and no plastic sheen.",
"details": "What this image exists to show is the CHANGE OF MATERIAL with the SHAPE intact: the same face as the scan, now in skin. Three things prove the shape was respected, and all three are the ones the generator most wants to fix: the eyes stay CLOSED, the head stays BALD and the cheeks stay FULL. Nothing of the machine survives in the image: the grain, the scan lines, the grey-yellow tone, the black exam frame, the ruler down the side, the numbers and the letters of the report all disappear completely. The final image has to be printable and framable as a portrait, not as a medical scan.",
"negative_prompt": "ultrasound grain, scan noise, scan lines, black exam frame, ruler, scale, measurement marker, medical report, text, letters, numbers, watermark, logo, open eyes, hair, marked eyebrows, long lashes, teeth, tongue, umbilical cord, placenta, adult hand, a second person in the frame, the look of a reborn doll, of plaster, of wax or of porcelain, plastic sheen, adult skin, the face of an older child, slimmed cheek, reshaped head, deformed fingers, a hand with the wrong number of fingers, blue cast, green cast, cold light, patterned background, AI artefacts, likeness to a real person"
}
How to use
The 3D ultrasound already shows the baby's face. What gets in the way is the grain of the machine and that grey-yellow tone, which make everything look like plaster. This prompt changes only the MATERIAL: the same shape as the scan, now in skin, with studio light. What comes back is a keepsake to print and frame, not a photograph and not a prediction of how the baby will look. It works in ChatGPT, Gemini and NanoBanana.
1. Upload the frame of the scan where the face is most complete and least covered by the hand or the cord.
2. Crop the scan before uploading, cutting off the ruler, the numbers and the clinic name down the side.
3. Do not touch the preservation block in subject. It is what holds the line of the profile.
4. If it comes back with open eyes or with hair, generate again. Both are in the negative_prompt because that is what the AI most wants to "fix".
5. Compare the profile side by side with the scan: forehead, nose, lip and chin have to be the same line.
Tip: ask for a soft black and white version as well. It reads more like a portrait and less like a scan.
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