Give Templates a Try
You can create a variety of unique effects by making a custom template. Start with a piece of clear acetate, which you can find as transparency sheets or plastic report covers in just about any office supply store. Take a craft knife and cut out the shapes you desire in the sizes you want. Then you can lay the template on your paper and draw or erase the specific shapes through it. You can reuse these templates again and again for countless drawings.
Custom templates are incredibly useful for the repetitious elements in a drawing. To avoid repetition that’s too predictable (and therefore boring), change things ...