Last July, I was invited to a two day workshop at the Clan Destin (a play on words of course), a very 60'ish theatre/pub/art center hidden in the countryside not far from where I live.
A lovely gymnast/actress had been hired to pose for us, moving very slowly and sometimes stopping for a few minutes, inspired by different kinds of music. Some of my fast sketches were just smudges and I had to clearly define hands and fingers to explain what was happening in them. Sometimes I took visual/mental snapshots from which I worked for a couple of minutes, refraining from looking back at the model so I could record a more detailed moment in time. Every hour we stopped to look at each others drawings and the model changed her outfit.
I don't think I have ever had such concentrated creativity and came home absolutely exhausted at the end of the day. Reviewing and reflecting on my 100 or so sketches several months later, I find them not too shabby! Here's a slide show of a selection: