{
  "mode": "built-in image_gen",
  "prompt": "Use case: stylized-concept. Production smoke effect animation for a detailed 1990s pixel-art first-person game. EXACTLY four equally sized square frames in a 2-column 2-row grid, true transparent background. Big billowing clubs of exhaled cigarette smoke, a broad irregular rolling plume, dense layered curling forms at bottom evolving into softer broken wisps toward top, four successive stages of upward motion and dissipation. Gray-blue with pale gray highlights, partially transparent, hand-painted clustered pixel-art shading, not photographic clouds. Smoke occupies central 65 percent of each cell with generous entirely transparent margins on every side. No hands, cigarette, sky, buildings, fog across the whole canvas, rectangles, cell outlines, words, checkerboard painting or background color. Same volume and style through all frames. Clearly readable broad smoke plume, useful game effect cutout, not a poster."
}