Look at the state of the person's hands, they might give a hint as to what they've been doing. A damaged knuckle for one means that the person has been in a fight, or something similar.
-
Edited by Turké Timer: 7/3/2014 6:39:00 PMWhat also helps is taking a day just to observe people and see how their body language works and what effect it has on other people. Then you can adapt that to yourself and tweak it to make yourself less open to deduction. This was inspired by Stumbleupon, actually. It's a great site to discover new things (but the longer I use it, the shorter my attention span gets).