Watercolor artist and author Doris Anne Holman, who taught at Cottrell School for 20 years and at Monmouth Middle School for seven, is known for her works featuring vibrant colors, wild surf and elegant birds. She focuses on yet another aspect of nature in the “May Flowers” exhibit opening May 1 at Stones and Stuff, 556 Congress St., Portland. In these works, like the one above titled “Poppy,” she uses layering techniques, brilliant colors and negative space to showcase nature’s divine inspiration. There will be an opening reception from 5 to 8 p.m. May 1; the show runs through the month.