Well, first look in the mirror, look at both your hair colour and brow colour, if your hair is not blue or something you can choose a brow colour similar to your hair colour. This ,however, can only be done if your hair did not go from brown to blond, cause u would have to choose Brown in that case. Try to identify your brow colour and look at which one matches the best. I use 02 light. And I am dark blonde with highlights.