This is Group 1. These images are very simple, just enough to convey that there is a person there. They are very gestural and don't focus on much detail.
This is Group 3. These sketches are gestural as well. What I appreciate about these is the sense of balance. I like that the two on the chair appear bigger but they are the same size. I also like that the two in the chairs backs are showing but the one sitting is facing you. I think it makes you want to look at the picture more.