One of the elements I draw the most are people. You really have to know when to add detail, when to do a quick outline, and how to place them to simply get across the point. Occasionally I have to draw a quick portrait on the spot. The one above I did of the US Forest Service's Chief Tom Tidwell recently for an illustration I was working on at their meeting. Below is the reproduction of a sketch I did of Pedro Noda over a year ago for American Airlines Cargo. He is using it for a presentation he put together to represent himself.