波普艺术拼贴画，四位标志性人物，木刻风格

A detailed pop-art collage arranged in a clean 2x2 grid, featuring four iconic figures rendered in an intricate black-and-white woodcut engraving and stencil-art style. Top-left panel: a visionary tech entrepreneur in three-quarter profile facing left, wearing reflective dark sunglasses with cool blue highlights, a black leather jacket, and a dark shirt, set against an explosive backdrop of neon yellow and magenta paint splatters. Top-right panel: an elderly scientific genius with wild white hair and a distinctive mustache, facing forward, dressed in a textured tweed jacket, collared shirt, and tie, surrounded by energetic cyan and black splashes. Bottom-left panel: a world-famous football athlete with a sharp, styled haircut and an intense expression, wearing a modern sports jersey with striped shoulder details, framed by vivid magenta and cyan paint bursts. Bottom-right panel: a charismatic Hollywood action star smiling confidently, wearing aviator sunglasses reflecting a bright blue sky and a black collared jacket, against dynamic yellow and cyan splatter effects. High-contrast monochrome portraits with dense cross-hatching, bold linework, urban street-art influence, contemporary gallery aesthetic, vibrant neon cyan, magenta, and yellow accents, white borders separating panels, ultra-detailed texture, crisp focus, energetic composition, premium poster design, modern pop-culture artwork, visually striking and collectible.