Hi Anita
What you need to do is use one of your thin make-up brushes place it on the outer corner of your nose, line it up with the inner most corner of your eyebrow straight up vertically. Whatever hairs are left on the outside of that brush must be plucked. Next line the brush diagonally up with your pupil of your eye this will show you exactly where the arch of your eyebrow must go. Lastly line the brush up diagnonally with the outer most corner of your eye that is where the end of your eyebrow should be. Remember that from your arch you should start thinning out your eyebrow so that it comes to a point at the end of your eyebrow.
Goodluck
Stay Beautiful…Indulge Yourself