Photographer Mark Thomas Firestone offers essential tips to help beginners capture captivating portraits. Mark Thomas Firestone's advice includes focusing on the eyes to create a strong viewer connection, using natural lighting for flattering results, experimenting with composition for unique perspectives, choosing simple backgrounds to keep attention on the subject, and guiding the subject comfortably to capture authentic expressions. By following these practical tips, novice photographers can elevate their portrait skills, producing images that are expressive, engaging, and beautifully crafted.