Completely outline all your whites first. Brush and sponge wet the unmarked areas and lay in the base colors with lots of pigment, because watercolors dry lighter. Let this dry then erase the pencil lines. While its drying is the time to scrape and pressure out small whites. If you do it while it's too wet, pigment will seep back into the scraped area and end up a darker color rather than lighter.
Timing is everything and excitement runs high.
Re-spray the painting with water after it's dried and lay in more washes, the first color down won't move. When this coating is dry clean it up and fill in any holidays. Now you're ready for the last step, calligraphy with a long-haired script brush. See the techniques in the the Painting on Location section. One of four in a series done on the same land.