I’ve been practicing sketching people now for a week. After doing 20 second and one minute sketches on and off all week I decided to slow down. I did these six figures in 18 minutes. I switched from using my usual Sailor Calligraphy pen to my Pentel 07 rollerball pen because it has water soluble ink and I could quickly add some grey tones by pulling color from the lines with a Kuretake Mini waterbrush.
It does help to practice. I’m getting better at seeing and drawing the shapes.