Sunscreen is great; a full face gaiter is even better. Not only are these gaiters perfect for keeping the sun off your face all day, they also knock out wind-burn, keep your face fresh and cool. Soak them in water to keep cool in summer or have them as a useful underlayer during those freezing winter mornings on the Eucumbene.
With a mesh mouth covering they'll let you breathe easy and won't fog up your polaroids. Coming in various ranges, including three different types of camouflage to sneak up on any situation.