Use the photo as the first frame and keep everything in it exactly as photographed: the same person, the same room, furniture, floor and light, and the same camera angle. A real vertical 9:16 phone video from a phone that does not move, one continuous take, no zoom and no cuts.
0-2 s: the person stays as in the photo, in the same spot and pose, with small natural moves only: they breathe, blink once and give a small smile.
2-4 s: a thin, soft vertical line sweeps slowly across the whole frame from the left edge to the right edge, like a wipe. Behind the line the person has changed: their body below the neck is now a round, chubby, fat seal body, smooth and plump, with no arms and no legs, two front flippers resting on the surface and the back flippers of a seal where the legs were. Ahead of the line the person is still as in the photo. The room never changes.
4-8 s: the person is now a chubby seal that keeps their own human head: the same face, eyes, eye color, eyebrows, nose, mouth, skin tone, age, hair color, hair length and hairstyle, and any beard, glasses or earrings exactly as in the photo, so their friends recognize them at once. The seal body is short, sleek grey seal skin with soft darker spots, like a real harbor seal, and no clothes. They rest in the same spot on the same seat or floor, blink slowly at the camera, wiggle the round body once and clap the two front flippers together once, with a proud, funny little smile.
Photorealistic, like a real video filmed at home, not a cartoon, not CGI. Exactly one person with one head. No human arms, hands or legs on the seal body, no animals, no other people, no water. No text, no captions, no logos, no watermark.
Audio: a light, playful plucked tune, a soft whoosh while the line passes, and one small happy seal bark near the end. No voice, no talking.
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