Monochrome Editorial Streetwear Poster Design

Design a contemporary vertical portrait poster in a 3:4 aspect ratio, utilizing the provided image as a facial reference. Transform the individual into a striking black-and-white duotone against a flat, vibrant cyan backdrop. Preserve the person's curly hairstyle, facial hair, and self-assured high-fashion posture. Outfit him in a roomy plaid wool overcoat featuring a double-breasted cut, layered on top of a textured ribbed turtleneck, with his hands resting inside the coat pockets. Overlay whimsical white sketch markings—such as a crown, celestial bodies, dashed rings, kinetic streaks, and painterly strokes—framing the subject. Incorporate prominent hand-lettered typography reading “SAY HELLO,” accompanied by a miniature sketched mustache situated beneath the words. Achieve a contemporary urban apparel collage style with a well-balanced layout and a centered framing cropped at the mid-thigh.