Read the wind before the map
Deer, foxes, badgers and otters live by their noses. If your scent drifts towards them, no amount of camouflage will help. Before you set off, check the wind direction on a forecast, then confirm it on the ground: a pinch of dry grass, a strand of thread tied to your tripod, or simply the side of your face that feels coolest. Plan your approach so the breeze blows from the animal towards you.
Wind also changes through the day. Mornings in valleys often bring a cool downhill drift that reverses as the land warms. Notice these patterns at your regular sites and write them down.