I found this more challenging than I thought I would. I am experienced in drawing this subject, but doing very quick studies was really challenging. Additionally, normally I would start my sketch at the head, which was not recommended in the exercise. I tried starting at the middle with somewhat better results in terms of getting proportions better early on, all of the sketches looked more or less the same but a few were much better.
I also found that working so quickly left me little time to review what I was doing, although I tried to look carefully at the proportions and relative space etc. I think I was also concerned for my model being uncomfortable and I didnt want to keep him too long as he was doing me a favour. He also became quite restless at times, I realise that even 5 or 10 minutes is a very long time to sit so still.
I liked working with charcoal best at this kind of speed as it was more forgiving whilst I was using it and felt easier across the paper, although there was not much difference generally in the outcomes. I also found that generally the top half of the body was larger in proportion to the bottom. I think this may have been because I was leaning on a board with my A3 sketchbook, rather than having my support upright, or it may have been that I was simply trying too hard to fit everything in. I produced 7 sketches in total, see images below.
Willow charcoal on paper (2 minute sketch)
Ball point pen on paper (2 minute sketch)
Conte pencil on paper (2 minute sketch)
Graphite pencil on paper (2 minute sketch)
Oil pastel on paper (2 minute sketch)
Graphite pencil on paper (10 minute sketch)
At this point my model wanted to change his pose as he was uncomfortable, despite frequent breaks, so I also made this the last sketch.
Charcoal on paper (10 minute sketch)
Deborah McAulay 