By the time the paintings are hung on the walls at Joy and Wylde Redstone Gallery, much of the work will already have happened outside. It will have happened along the Crystal River, on Redstone Boulevard, in Marble and anywhere else an artist can find the right mix of light, color and mountain backdrop. The Redstone Plein Air Festival returns June 22-28 for its third year, bringing more than 30 artists to the Crystal River Valley for a week of …