Carole, Let me suggest one possibility:
Hotel Airiños is in the town of Cangas de Morrazo, across the
ría from the city of Vigo. It is a very picturesque town and very accessable to Vigo via a short ferry ride. Cangas is right on the water, it has a walkable paseo maritimo and a nice old section of the city. I am partial to Cangas because it is where my family lives...
, but I think you would find a lot to paint. The little towns nearby are all little fishing villages.
Here you can learn a bit about the area too.