you don't need to be a sculptor to chisel your features. when you add a few subtle shadows in the right places, and highlight others, it gives you angles that make your bone structure look elegant and defined.
celebrity makeup artist Mally Roncal (love her!) strokes face powder two shades darker than her star clients' skintone (think of using some shade of brown you would be if you got a tan) along the sides of the bridge of the nose (from below the eyes to the tip) using an eye shadow brush. add a highlighter down the center to create the illusion of a slimmer nose.
this same technique can be achieved to enhance the cheekbones, creating a more defined look. to do this, suck in your cheeks, apply a darker shade to the hollows and a highlighter to the top of the cheekbones. then apply blush as normal. be careful-- don't over do it!
play around with contouring, try Make Up Forever Compact Modellers or Stila Face Contouring Trio. discover how it gives balance to the face and remember to practice, practice, practice-- especially if you are new to this makeup trick. and as always, have fun and be fabulous!