When they move, I generally start a new sketch. Drawing from potentially moving life forces me to draw faster because I never know when they will move. Even when people are asleep, they'll toss and turn some.
The paper (Strathmore Sketchbook) is first colored by using a mix of some cheapy gouache sometimes mixed with gesso. For these drawings, I used Pilot G-2 Gel pens.
Evidently, I have no clue what economy of lines means.
