Cross-hatching is the same as hatching, only the lines can go in multiple directions.
Depending on your style you can be as subtle as you want with your cross-hatching.
Loose cross-hatching is good for beginners or specific styles (for example, comics or any ink drawings).
You can tighten the cross-hatching to make darker values, or loosen it the create light values.
Tight cross-hatching is the same, but your lines are drawn so close together that it looks smooth.
OUTLINES AND LINE VARIETY
WhEn you begin your drawing, start with a harder pencil to create lighter outlines. A drawing usually has two layers of outlines. The first is a light outline that is used as a guideline to create your basic shapes. To create this technique you want to use less pressure as you press down on your pencil and draw in a slow smooth motion. You’ll want to be able to erase some of these lines as your drawing evolves.
The next is to create a heavy outline that will be used to define the edges of your elements. Begin by retracing your original lighter outlines and adding more pressure as you go along. You still want to be careful that you don’t press down to hard making it harder to erase your lines. In this stage you’re still developing your outlines and want to be able to erase if you make a mistake. As you continue to work on your drawing the outlines will become heavier as your edges develop. Your final outline will be much darker than the original lighter layer that you created.