It turns out that drawing a fingerprint is almost as complex as drawing a brain. This time we'll also use a template that we'll erase later.
A fingerprint is a unique pattern created by skin ridges, which looks quite fractal. It consists of lines of approximately equal thickness that spiral in circles or curve gently.
To draw a fingerprint, we'll take a semicircular shape that roughly resembles the shape a thumb would leave if you wet it and press it against paper. We'll draw this shape and gradually begin to fill it in.
I started with one curved line and then added new lines around it, bending them. To make the pattern unique, you can add several more lines around which we'll curve the others.
Sometimes it's better to break the lines, leaving gaps in them to make it look more realistic. When you've filled in the entire template, remove it, and you'll have a drawing of a fingerprint.