Brows are an important part of a finished look. I used to not fill my brows, but once I started, there was no turning back. I don't feel finished without a little polishing.
Here are the tools of my daily look, Anastasia Brow Powder Duo in Medium Ash and Anastasia Duo Brush #7:
I have already tweezed and shaped my brows beforehand.
I find it is best to work with your general shape and not over correct too much. Don't try to go for a high arch if it isn't there, or try to make thin brows out of a naturally full shape.
First I comb upwards and out with the spoolie end of my brush:
Taking a mixture of both colors of powder, I start on the bottom inner corner of my brow. I use the angled brush to gradually build the color and shape:
Next I work on the upper line and arch of my brow. I try to thicken and shape the middle of my brow:
This is how things look now. The front of the brow and arch are more defined and thickened:
The last area I fill is the tail of my brow. I sweep downward and thin the line:
Comb with the spoolie again and check your overall shape:
Here they are for comparison, filled on your left:
And now, through the magic of cosmetics, here is a completely finished eye:
I hope this tutorial was helpful!