PORTLAND, Ore. — On a crisp, bright fall Saturday morning, Portland's Director Park awakens. A woman moves through her exercise routine. A pianist fills the air with music on an outdoor piano open for all to play. For Amy Stewart, the co-coordinator for the Portland chapter of Urban Sketchers, it's all picture perfect; a good day for sketching, and a chance to capture the contours of the city she calls home. "You know, the trees, the cars, the people going by, just the energy of the city.