I personally think the eyebrows are the most important feature of the face. Have you ever seen one of those pictures of people without their eyebrows? It’s a huge difference and not for the better. If you’ve got really light eyebrows and you want to make them a little darker, you can use an eyebrow pencil. Try to use the same colour as your hair, or one that resembles it.
First, colour the base of your eyebrow with the pencil and then the end. Then, use eyebrow powder of the same colour ( you can also use eyeshadow ) to fill up the rest. If you want you can use a tissue to cover up the skin above the eyebrow, so you don’t go too high.
Don’t worry if it’s a little too dark, you can remove the excess by combing trough with an eyebrow brush. Afterwards, you can easily see the difference and it’s not difficult to do at all.
You can also use a stencil that matches the shape of your eyebrows to help you.