Nod the head once while the shoulders stay in place

Original, untested video brief. No input image or generated result is supplied.

1. Task and boundary

Follow a small downward pitch of the head, then a return to the original orientation. The nose and chin should travel as parts of the same head while the shoulders remain a steady base. A chin that merely shortens, or a face that slides down the neck, does not show a nod. Choose a view that makes the change in head orientation readable.

Use one modest nod without a side turn or repeated bobbing. Allow the visible neck contour to change naturally with the head’s pose; do not demand a perfectly rigid neck. Keep the torso from bowing forward. This plan tests continuity in a generated image sequence, not neck mobility, agreement, attention or any medical condition.

2. Authorized first frame

Prepare a portrait or illustration you own or may use, with permission from the depicted adult for this animation. Use a three-quarter view from above the head to the upper torso. Start with the head upright and the shoulders relaxed. Show the chin edge, nose tip, ear area and both shoulders clearly enough to compare their relative positions.

Keep the neckline visible and avoid a tall collar, scarf or long hair hiding the chin-to-neck region. Include some space below the starting chin so the downward part remains in frame. A stable background line helps detect camera tilt. Begin with a neutral mouth and an ordinary gaze, since a separate expression change is not needed.

3. Use the generator

Open the current image-to-video generator in a mode accepting your authorized first frame. Paste the complete prompt, check the available settings and cost estimate, then submit only when ready. This page supplies text; it does not upload an image or start a generation.

4. Prompt and timing

Begin from my authorized three-quarter portrait of the same adult with upright head and still shoulders. Lock the camera and keep the shoulders and upper torso in place. Make one small, smooth downward nod: the head pitches forward at the neck, carrying the original nose, chin, ears and facial features together. Let the chin move lower and slightly toward the upper chest without collapsing its shape into the neck. Pause briefly at the modest lowered angle, then reverse the same motion and return to the original upright orientation. Preserve the face, head size, hair and neckline. Do not bow the torso, turn sideways, stretch the neck, slide the face vertically or add repeated bobbing. No new smile, talking, cut or camera tilt.

Opening: identify the starting head angle and the stationary line through the shoulders.
Middle: compare the nose and chin motion with the ear area and neckline; inspect an actual orientation change.
Ending: follow the upward return and compare the final head angle with the opening.

These beats are author suggestions, not exact model timing guarantees. Adapt their proportions to the clip length actually available.

5. Inspect the output

After inspecting your own output, record a time or frame, visible observation and pass, fail or inconclusive judgment for each condition. A convincing ending alone does not verify the preceding action.

The same head visibly changes pitch, with facial landmarks moving together.
The shoulders and torso do not bow forward or rise to meet the chin.
The chin remains an intact contour rather than melting into the neckline.
No added sideways rotation replaces the downward nod.
The return restores the original head angle through continuous motion.
If cropping or hair hides the chin-to-neck relation, mark that part inconclusive.

6. Fix one failure

The torso bows: show both shoulders and explicitly hold their position.
Only the chin shrinks: ask for the whole head to change angle and preserve the jaw outline.
The face slides vertically: describe pitch around the neck rather than simply moving down.
The head turns sideways: remove look down to the side wording and retain the original facing direction.
The camera tilts with the head: use the background line and shoulders as fixed image references.

7. Ending and limits

End with the same upright head orientation, unchanged shoulders and a neutral expression.

Save your own generated result through the available result controls, together with the authorized input, exact prompt, settings and inspection notes.

No generated take or angle measurement is supplied. Frame inspection can reveal a visible nod and unwanted drift, but cannot verify cervical mechanics, comfort, cognition or the person’s intended message. A hidden transition remains unverified.

Compare the moving body segment with Standing bow: a hip hinge, a pause and one return, where the torso inclines at the hips. For a different head action, Eyes first, head second: a small gaze-and-turn exercise sequences gaze and turning. This nod requires head pitch with still shoulders; neither a torso hinge nor a sideways look supplies that evidence.