Canada flag pen drawing (and some tips).
A technical pen (also fine liner) has a single brightness value (usually black).
To create different brightness values with a pen, use more lines for a darker value, and fewer lines for a lighter value.
In addition, you can use hatching and cross-hatching for different values.
Most known fine liner brands are waterproof (I tested some of the brands I use with a brush with water).
In addition, all the fine liners I tested (a week in front of direct sunlight) are fade proof (lightfast).
In the next example, you can see how the marker colors faded with exposure to direct sunlight, while the pen marks remained sharp and vivid.
