Get the perfect shape
It's easier than you might think to create a balanced brow with the perfect arch, every single time.
Grab an eyebrow pencil and look straight into the mirror. For your right eyebrow, place the pencil just on the outside of your right nostril and point it straight up along the inside corner of your eye until the tip touches your brow. This is where your brow should start. Use your pencil to mark a small dot at your starting point. Next, keep the pencil placed by your nostril but move it right at an angle, to the middle of your iris. Mark this spot. This is where the top of your arch should be. Finally, move the liner a little further right so it aligns with the far right corner of your eye and mark that spot with a small dot. Your brow should end here.
Do the same for the left side, starting on the inside of your left eye and mark the three points until you reach the outside of your eye. Now, all you have to do is fill in your brows by connecting the dots!
Go easy on the grooming
Rule number one about eyebrow grooming: Avoid over tweezing. Pluck when pores are open (like after a warm shower) and make sure you groom your brows with a brush before you start. First, trim the longer hairs with brow trimmers (Sephora, $18). Then, use the same technique above to mark your ideal arch and length before you start plucking away.
Slim a round face or full cheeks
While every face shape is different -- from round, to square and even diamond -- how you shape and fill your eyebrows can actually make your face look slimmer. For example, many makeup artists will tell you that thinner eyebrows actually accentuate fuller cheeks. If you'd like to fake a slimmer face, opt for fuller eyebrows. Also, eyebrows with a more pronounced arch can actually elongate your face.
Two-in-one eyebrow tools with a pencil and gel, like Revlon's Brow Fantasy (Target, $7), can help you get a fuller, more natural look.
Create bigger eyes
If your eyes are more deep-set, opt for a brow pencil or powder color that's one or two shades lighter than your hair. You can also line your bottom lid in that lighter shade, to make your brows play more of a background role and make your eyes look bigger. The same goes for small eyes -- the softer the brow, the bigger your eyes will appear.
Laura Mercier's Brow Powder Duo (Bloomingdale's, $24) comes with two shades you can use to experiment with tones and create the perfect powdery-soft brow.