Materials:

To practice this demo, use all watercolor painting materials you have plus the following.
-Three primary watercolors: cadmium yellow light, ultramarine blue and cadmium red deep
-Arches 140lb cold-pressed watercolor paper.
-Art masking fluid.-Three small dishes for diluting the three colors.
-Packing Tapes and a plywood board that is larger than your full sheet paper.-Hair dryer and a water sprayer.

1. Use packing tape to tape down the perimeters of your paper on the plywood board.
2. Put the pigments into the three small dishes separately and dilute them with water.
3. sketch the three birds and trees on the paper with pencil.
4. Use masking fluid to mask out the birds, tree leaves and some areas of the trunks.

Use the water sprayer to wet the whole paper surface lightly. Pour the yellow liquid from the small dish at the top area of the painting. Spray more water around the colors and use your hand (if you are not afraid of poison pigments) to direct the color flowing direction. 

Pour the red and the Blue liquid from the small dishes at the upper area of your painting. Tilt the plywood board so that the color liquids flow down to the water area of the swarm. 

3. Paint the trees. 

Use a large flat brush to get a lot of blue and little red pigments and mix them into black like color. Paint the tree trunks and branches at the foreground. Than use another brush to mix red, little yellow and blue to paint the distance tree trunks.

4. Dry the painting and take off the masking.

Use the hair dryer to dry your painting. Cut the packing tape into 2" pieces. Use your finger to press the tapes down on the masking to take off the masking.

5. Paint the details of the pelican. 

Use two rounded brushes, one for applying color and the other for blending the colors with water. Mix very intense blue and little red to paint the color the feathers. 

6. Finish the details for the pelican and paint the leaves.

Continue to paint the bird. Then use a flat brush to get yellow and little red to paint the leaves.

7. Paint the other two pelicans.

Also use two round brushes to paint these birds. Start from the beaks, then paint the body, wings and finally the legs. 

9. Paint other leaves and water plants.

Finish all other leaves. At the top of the painting, use light yellow. Similarly, use light yellow to paint the water plants. Sign your name at the lower right corner where needs more objects for composition balance.