Camera: static frame with two subtle snap-zoom pulses timed with each knock, slight handheld shake. Action: a young girl with braided pigtails, fist already raised near her face, knocks playfully on the camera lens with her knuckles twice in a row — like knocking on a door, "knock knock, who's there". Each knock is a light, quick tap forward followed by pulling the fist back slightly before the next knock. Her fist stays loose and relaxed throughout, not clenched hard, and her head tilts slightly with a mischievous smile as she looks into the camera. Style: grey hoodie, white fleece scarf, braided pigtails, beige studio background, soft even lighting, kids fashion commercial, 4k. Audio: no background music, only natural ambient sound — two soft knock taps, a playful giggle.
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