Craft a cartoon-style poster with a chiaroscuro effect, where the stark contrasts of black and white create a dramatic cosmic environment. within this shadowy, star-studded expanse, a quirky little witch, portrayed with a playful twinkle in her eye and a mischievous grin, contemplates her next spell. spiraling around her, portals pulse with dynamic contrasts, offering glimpses into other monochrome worlds where the fantastical and the cartoonish collide in a dance of light and shadow