This was my first effort this morning of a guy sitting at the opposite table on the train, which has too realistic proportions and not what I was aiming for. Still, just warming up.
My second was better and looser as I spied a long face through the gap in the seats.
Then I saw this guy pass by my window as he left the train at Clapham Junction! He had such a squished up face and I had to try and get it down from my one quick glance, but I think it's much more successful for it.