As I like to pretend I'm living in the 1940s 80% of the time, I'm a fan of that "badge of courage", red lipstick. It makes me feel womanly, confident, don't care-ish. But it can be high maintenance. And there are times when I want to be less full-on. Paradoxically, these are the perfect times to go nude.
A nude shade says "I have made a bit of an effort". While I tend to go barefaced most of the time anyway, if I do succumb to war-paint, it's often the full works - eyeliner, mascara, lipliner - the business. If I'm wearing blusher, I'm really serious.