Outline of a Conversation
I correctly rendered the relative sizes of the two figures in the sketch below. The outlines were sketched, for the most part, as blind drawings.
I carefully outlined the two left-most figures and added some internal features. I drew the mustache on the next figure very quickly, along with the rest of the face. As for the fourth person, I drew him with tentative strokes, a totally different technique than I used for the first two portraits.