This sketching style is called "reportage".
The artist draws from life and the pen is never supposed to leave the paper.
So you will start drawing in one corner, and then just expand out in whatever direction it takes you.
Color and shading can be added at the end.
The group shot on the couch (2nd image) was from last Friday night, when we visited with the Martels for the last time before they took the kids home for the summer. Everybody was gathered around the TV to watch Hamilton.