Highlights are bright and contours are dark. Use bronzer or darker eyeshadows (in the crease) to create depth or contour, and use illuminators, highlighting pencils, etc. to brighten up the face for the highlight areas. It will make a huge difference!
The Ultimate Makeup Application Guide for Blushes, Bronzers, Highlighters & More - Our ultimate guide for applying concealer, bronzer, highlighter and blush is the only step by step makeup tutorial you need!