低多边形马赛克风格

Transform this image into a refined low-poly mosaic style. Preserve the original structure and recognizable details, especially facial features and contours. Use small, high-density polygons to maintain clarity and identity while creating a crystalline, faceted look. Keep the original color palette for a harmonious and natural aesthetic. Avoid altering or adding new elements.。工作流：生成多张候选后再做 best-of-N 筛选，可避免一次性出图的不稳定。