In general, there should be no more than an inch and a half between your brows. A good rule of thumb is to take a pencil and place it vertically next to your nose, extending up to your eyebrow. Your brow should not extend to the other side of the pencil. To figure out where your brow should end, slant the pencil (keeping the end by your nostril) so that it extends past the corner of your eye. The arch should be in line with the outside edge of the iris of your eye when you are looking straight ahead. However, if you do not naturally have an arch, don’t try to make one. You could end up with two uneven arches and it will ultimately look unnatural if you don’t have one to start with. Try cleaning up stray hairs and work with what you have.