Here are a few pages from my March sketchbook.
I use 6B pencil or .07mm mechanical pencil, depending on my mood that day. Except for the last page, I drew the portraits from life.
I used to draw everything on newsprint, because the inexpensive paper kept my drawings loose. But now I've got random saved pieces of newsprint kicking about...
As of March, I decided to keep a sketchbook. It seems to be forcing me to take more care with my drawings, which is great. I do believe that it's all about the drawing. And, being tight and specific in sketchbooks is helping me draw confidently and loosely when approaching watercolour paper. : )