Artist Joan Carlson gets some paint on a brush while demonstrating watercolor technique in class. Fort Mill artist Joan Carlson teaches a watercolor painting class at Fewell Park Recreation Center in Rock Hill. She has been working in watercolor for 20 years and teaching classes for 10 years. For information on other classes and programs at city recreation centers go to www.rockhillrocks.com. ANDY BURRISS — aburriss@heraldonline.com Buy Photo