Many good tips here. Lets not forget to use every resource available though.... by this I mean our ears. Listen after the shot as well as watching. Many times on a good shot, in thick cover, you may not be able to see the deer after it runs off a bit. Most times on a good shot you will be able to hear the deer pile up, a good indicator that a long wait is not needed. Wounded deer will make noise as they flee, these sounds can help lead you in the right direction!!!