Watercolor Foundations with Roberto Osti At the Philadelphia Sketch Club - sketchclub.org/watercolor-f... - July 8, 15, 22, 29, 2025, 9:00 am-12:00 pm - In person Course #watercolor #watercolorcourse #sketchclub #watercolorclass, #learnwatercolor, #artworkshop, #philadelphiaart, #watercolorartist