Mixing Trails and Thicknesses - Pay Attention To the Water!
This 5.5 minute video illustrates the technique and importance of learning to mix paint and water in a deliberate way. By looking at your mixtures on the palette in terms of varying thicknesses (skim milk, 1%, 2%, whole and yogurt) you get to see clear and distinct values. Just vary the amount of water and paint, and practice, and you should get the hang of it quickly. it's only paint and water. Looking at a finished watercolor painting, value by value, shows the strength that can be created with good practice in this technique.