1) If a deer has spotted you don't fall for the triple headfake. No matter what it does I plan for the deer to snap up from a feeding position at least 3 times.
2) If you have a doe in front of you watch her ears. If she has one pointing behind her she is listening for something that may be trailing. They keep those things on a swivel like a radar dish.
3) This may be the oddest, but if I'm wtg for a deer to make its way closer I don't make eye contact with the deer. Instead, I focus on where the deer is heading and the spot behind the shoulder.
4) Sit still and take in the show. Even if the deer action is slow, its sure fun to watch the woods come alive in the morning.