I sat down just after posting those circles and decided to just doodle using the pen I normally use for inking. I found myself drawing quick sketches of people on the TV. Now this may not seem anything special to you, but if you look back at this post, you will see how much difficulty I had the last time I tried this deceptively simple looking method of drawing. Here are tonight's attempts:
I don't know why I found it so much easier tonight. I haven't been practicing, so I can't put it down to that. I'll have to do a bit of pondering to find the answer!