It's amazing to me how often you can look right at a deer and not see it. It really takes practice to be able to find the animals. If I can't see one, I then use my binoculars(a good set is crucial) to scan the underbrush looking for movement.
You do not have to be 200 yards away to use your binoculars. Even 25 yards away they will open up the cover so you can peer right in. Look for flickering flashes of white(tails and ears) and horizontal shaped images(logs,rocks,deer).
Oh and of course antlers.