Design a promotional poster for a character inspired by the Dr. Stone series, with a vertical layout suitable for Facebook posts (4:5 aspect ratio, 1080x1350). Use a pyramid structure, with larger elements at the top and smaller ones at the bottom: the top should feature a very large head, a shadowy facial silhouette, glowing eyes, or half of Senku Ishigami's body as the main visual element, creating a strong, distinctive, and instantly recognizable silhouette.