Last night, over drinks, my neighbor Pier asked if I ever drew people from life.
I replied, "Sure, but only a few times with models. Mostly people on the subway." And then added, "...but they still mostly look like the way I draw people."
In August I had to jaunt to DC for a day for my day job. Waiting for my colleague's arrival in Terminal C (my first time there! I'm usually in Terminal B or E at BOS!) I saw they ginger otter reading a BOOK and couldn't resist sketching him.
I used to do this all the time on the subway. Mostly to get the way someone was holding something, or the folds of cloth, etc. Sometimes people "caught" me and were all into it. Others didn't care. Only once was someone annoyed.