You may also have sparse brows that look unfinished, and a way to add a more polished look is to fill them in. You can get your eyebrows tinted to your desired colour but that wont define the shape.
I'm not going to go into eyebrows shapes and all of that however I did want to share how I filled mine in. It is really quite simple and is just another step in the morning that I believe I cannot go without :) So here it is.
At the moment I'm using an eyeshadow and a small angled brush to fill mine in, the e/s I'm using is the dark brown colour in the Sleek Storm palette which is darker than my natural eyebrow colour but not darker than my hair. I find if I get a bit heavy handed it can be too much, though. If you are blonde you do not want to go 10 shades darker than your hair, also be careful of ashy or redness in some browns.
Please let me know if this was helpful, confusing or not explained properly! I would love to hear your feedback.
Remember to never forget about your eyebrows :D