Watercolor Painting - Pebbles 15 x 22 inches

Did more on my pebble watercolor painting last night.  I have a question about color consistency since I span my watercolor painting over several days.  If you are doing sections of watercolor with a limited palette, you can do it and span your painting over several days.  In this case of the pebble watercolor painting, each or groups of pebble can be painted separately without affecting others in the picture.  Also I am using a limited palette of four colors of various mixes.  Those colors are Cobalt Blue, French Ultramarine Blue, Windsor Green and Alizarin Crimson.  Cobalt Blue was put on first and after it is completely dry, a mixture of Ultramarine Blue and Alizarin Crimson is used and last, various mixture of French Ultramarine Blue, Windsor Green and Alizarin Crimson is applied for the dark areas.