Observational Drawings Photo credit: Isaac Mangold. https://www.isaacmangold.com/contact View fullsize 2018. Charcoal. View fullsize 2018. Sumi Ink. View fullsize 2018. Charcoal. View fullsize 2018. Charcoal. View fullsize 2018. Ink. View fullsize 2018. Charcoal & Color Pencil. View fullsize 2020. Charcoal. View fullsize 2020. Charcoal. View fullsize 2020. Charcoal. View fullsize 2020. Charcoal. View fullsize 2020. Acrylic.