Feminine eyebrows don't have to be ultra thin or highly arched, but they do need to look balanced. You can accomplish this tonight and still look just fine at work tomorrow.
In many ways your eyebrows establish your whole makeup placement, which is why you need to get their shape right before you try other cosmetic corrections. The length and arch of your brow influences the way your nose is seen by others and affects the way you place your eye makeup. Properly shaped eyebrows open up the center of your face, soften a prominent nose and strengthen a small one.
Each brow should follow the natural curve of the eye and of the line of the nose. It should go toward the nose line, but not fall too short, which is a mistake many of us make by working too hard to clean up the hair between the brows.
An easy way to figure out the right length for your brows is to take a pencil and hold it from the outside edge of your nostrils to the inside corner of your eye on up to the browbone. Your hair should start (and end) at that point on the brow bone. Look at the drawing above for help with this.
Next, take the pencil and find the line from the outside of your nostrils to the outside corners of of each eye. Where this line meets your browbone should be the extreme limit of your eyebrow hair. Unless there is some corrective need, which we'll discuss another time, don't go past this point. It will look phony.
Many of us don't have hair that goes quite to this point. You can correct that by using pencils very lightly to fill in the gaps. What ever color hair you have, try to use two pencils, one dark, one light, in order to avoid the obvious "painted on" look. Stroke very lightly, don't "draw" a line in. You are trying to make it look like you have hair there, not makeup.
Now for some personal bias: The less pencil you use the better.
Frankly, most of us have more than enough eyebrow hair (would that were true for our heads). We don't need to put a lot of color on them, in fact we often need to do the opposite. Instead, get rid of the hairs between the brows, and if necessary, the ones on that go past the end points you've just found.
Before you get crazy with your plucking, remember that very few women have pencil thin eyebrows any more. Marlene Dietrich brows may turn you on right now, but they'll be pretty hard to explain around the coffee machine tomorrow.
We'll talk more next time about plucking strategies, but for now just try to eliminate those below the brow bone. It's usually also okay to yank out the really long hairs, though you can overdo this too.
The key things are neatness and balance. Achieve those and you'll have beautiful eyebrows without any raised ones at work the next day.