In most cases you can find your start point by using a specialised brow ruler or pencil and positioning it upwards from the edge of your nose or the middle of your nostril, if your nostrils are pronounced. Mark this point with an eyebrow pencil and repeat on the other side. Remove any hair on the inside of these points.
The next important point is the ARCH. The arch determines where the highest point on your brows should be. Even if you want to achieve a flatter or rounded brow, there still should be a highest point in the brow shape. The arch can be determined in a few ways, but the universal method is using specialised brow ruler and positioning it from the middle of the top lip (the cupids bow) and extending through the pupil (centre) of the eye. Make sure to look forwards and straight ahead when you are finding this point. Mark this point with an eyebrow pencil so you know where the arch should be. If you have a high forehead, the eyebrow can sometimes be brought up a touch higher to help the forehead not seem so large. Ensuring the arch is correct, can also give the eye a brightening or lift effect with many people saying that a good brow shape is like having a mini-facelift. If you have a small forehead, the same effect can be achieved by ensuring the arch is a little lower so it gives the illusion of more space on the forehead area.
The END point on the brow is found by extending the specialised brow ruler or pencil from the centre of the top lip past the edge of the eye. Where this sits on the brow bone is where your eyebrow should finish.
The key to eyebrow shaping is ensuring you accentuate or minimise your 'natural' brow shape. The thickness, shape and balance of your brows are all determined by your features. We are all born with the shape that suits us and if shaped according to these factors, we can all have eyebrows that are perfect- just for us.