Thin eyebrows can work on women with very petite facial features or features like small chins or foreheads–thinning out the eyebrows opens up their faces. For the rest of womenkind, though, going too thin looks like you have two worms over your eyes. Or, in some cases, women remove all of their eyebrows and it just doesn’t work.
Going too short
Thin and short are different things; thin refers to the width fo the eyebrow from top to bottom, and short refers to how short you actually trim the hairs that you leave on. Going too short can look like you gave your brows a buzzcut. Hey, at least, they’re army-ready.

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Shaving them off
Some women believe that the best way to control the eyebrows is to shave them off entirely, and draw them back on exactly as they want them. But you need actual hairs on your brows; otherwise, you begin to look like a mask instead of a real face.
Cutting them off on the sides
The eyebrow should cover your entire eye, and then some. A half a centimeter beyond the eye, towards your ears, should suffice. If you pluck or shave your eyebrows on the sides such that they don’t cover your full eye anymore, your entire face looks squished.

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The tadpole
Shaping or designing the part of the brows that meet in the middle, over your nose, is never a good idea.

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Drawing them in too thick
Super thick eyebrows, like super dark ones, is another look reserved for designer spreads in Vanity Fair or Vogue. The rest of us look like we have caterpillars on our faces when we go too thick.

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Doing any color that isn’t natural
Orangey red, purply brown, or any color that wouldn’t naturally grow out of a person’s hair follicles does not belong on your eyebrows. Even if you have purple hair or pink highlights, your eyebrows should remain a natural color, or you begin to look like a clown.
Not blending
You must use a blending brush after applying brow gel. Otherwise, you have an awkward and pronounced line where the coloring stops and your real hair color begins.

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Dying them
Maybe two percent of women who dye their eyebrows are lucky enough to achieve the desired color. The rest of us are stuck with a bad brow-dye until it washes out.

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Putting the arch in the wrong place
The arch should not be in the very center of the brow. That is where clowns put their arches. The arch should be between the center of the brow and the outside end of it, to open up the eye.
The V
Eyebrows should be in a round shape. Straight, diagonal lines that start at the center and go out towards the forehead look like you have a line of ducks, flying in a V, on your face.