You're probably most comfortable with a very natural look, and that's actually a good thing! The right cosmetics simply enhance your face - never mask it or go for a look that takes more than 10 minutes.
After all, you have important things to do! But remember: looking good will make you feel more confident, so take a little time and try one of these techniques.
Smoky eyes. You need not go extreme, but smudging the upper and lower lash lines with black, charcoal, or a deep bronze will look amazing. Add a couple coats of mascara and your eyes will look sexy.
A red lip. Sure, it's bold. You can pull it off! Just find the right shade for your skin tone.
Go light on the blush or bronzer - just use it to liven up and highlight areas that the sun hits.
Curl your lashes. It will instantly make you appear more awake, even if you've been working long hours or having a bout of insomnia.
Play around with eye shadow. Just a darker color in the crease and a light color on the lid, blended up into the crease to make it seamless, is all you need. Browns, grays, and smoky purples should work best.