Reference frame, scene 3. Vertical 9:16. Pixar-style realistic 3D,
classroom front, daylight, film grain. Composition: Alisa_master
presenting, holding up the SmartBlack_master dispenser and a stretched
black floss strand between her hands, pointing at it, braces, confident
expert face, mouth in frame, REVYLINE branding readable; class leaning
in. Camera: medium close-up. Key visibility: REVYLINE branding + black
floss contrast sharp, expert delivery readable, mouth in frame.
Negative: no on-screen text, no logos other than Revyline, no flat
cartoon, no anime, no obscured product.
