Makeup is meant to highlight your features. To make things pop. To draw someone's eye to a certain place and make them say 'wow.'
Pulling that off is hard enough, but achieving a balance is the real challenge. Sure there are a handful of celebrities (with a team of makeup artists at their beck and call) that can handle a smoky eye and a bold lip at the same time, but you'll find that your styling will have more impact if you pick just one feature to blow people away with!