In the video below you can see how I make a line drawing of a tree. I had drawn a similar tree a while ago, but the quality was not really good. So I used the Affinity Designer app to redraw the tree.

The tool is pressure sensitive. That means I can draw a thicker line with more pressure on the stylus. I usually do this at the beginning of a line and let it run out by decreasing the pressure more and more. In addition, Affinity Designer has a nice function to automatically stabilize the line. This means that small deviations, for example due to muscle twitching in my hand, are automatically compensated for. This is very useful!