If you dampen your paper before you apply the watercolor pencil, you'll get softer, broader lines of color than if you draw on dry paper. Work carefully, and don't use pencils that are extremely sharp, so you don't damage the surface of the paper.
Another option is to wet the tip of pencil or crayon before you use it. If you dip the tip of a watercolor pencil into some clean water, or dampen the tip with a wet brush, then draw with it, you'll get lines of intense color. As the pencil dries out, the line will become lighter and thinner.
More Techniques to Try with Water-Soluble Pencils:
• Scraping Color off a Watercolor Pencil
This is a great way to create texture. Use a knife to scrape off tiny bits of pencil. Sprinkle these onto wet paper, or drop a bit of water on top of them, and watch the color spread out.
• Using Watercolor Pencils 'Dry'
Don't get so seduced by the watercolor properties of watercolor pencils that you ignore the rich color and detail you get when using them 'dry', in the same way you'd use ordinary colored pencils. Leave some of the pencil undisturbed, or apply fine detail with a dry pencil once the washes have dried.
