Don’t confuse the name of the medium pastel with the results it produces. Though pink, baby blue and soft yellow are certainly options, pastel paintings are often wildly vibrant and dramatic. And mastery of pastel sticks, whether oil or chalk, requires considerable effort. Helping artists achieve that mastery is the mission of the Vermont Pastel Society, and a current exhibition of member works at the T.W. Wood Gallery in Montpelier puts their successes on display.