Create a monochrome, cartoon-style poster that encapsulates a retro, silent film era charm, presenting a vast cosmic void filled with shades of grey, black and white nebulous mists and twinkling stars reminiscent of old-school animation. in the midst, a petite witch with a whimsical, oversized pointy hat occupies the center stage, striking a playful pose of bewilderment. surrounding her, a series of stylized portals swirl with various shades of grey, each framing a doorway to a different, magical cartoon dimension, evoking a sense of enchantment and nostalgia