iPad portraits at TED Global

TED Global took place  in Edinburgh last week and I made 50 portraits of the participants during the breaks.  It was an interesting experience.  Normally I sit at home, alone and have a full day to make a portrait.  I love good paper and the feel of a brush or pen. Now I was surrounded by spectators, with a nervous sitter in front of me and worked on the tiny, smooth surface of an iPad with 10 minutes to create a likeness.  Getting good looking lines and making it look digital, rather than an imitation of a portrait on paper was quite a challenge.
I tried various approaches during the different days of the TED Conference and the results can be seen here,
Below are a few examples