Choose a subject and find an analogous combination which supports its dominant color/s. An analogous combination contains colors next to each other on the wheel and only one primary. Shown here are yellow-green, yellow (primary), yellow-orange and orange.
Include tints, tones and shades if possible. Blend them into each other horizontally. Blend tones and shades vertically. Make tones by finding a suitable stick or mixing gray with the pure color.
Find the complements to the analogous.
Blend together. Add tints. Use a soft white to make tints and or use stick tints of colors. Blend using sticks and soft cloth. note: I did not use any fixative in this process.
Choose a color from your initial analogous combination to tone the page. Consider your subject; what do you want to emphasize or accentuate.
Sketch in the general shapes, measure proportions. Use a pastel pencil or nupastel stick.
Zoom in and enlarge.
Lay in background tints, darks and whatever strikes you. Let the tone of the paper come through as a middle value.
Layer in local colors. Refine the drawing as you proceed. Blend choice areas with a soft cloth and fix.
Maintain your initial palette and expand the range of each color.
Complete the process with soft tints for highlights and back-lit areas. Lightly fix so as not to diminish white chalk. If you loose light areas re establish them and lightly fix again.