I've got naturally dark blonde hair with eyebrows the same colour although some of my eyebrow hair is white blonde.
I pluck my eyebrows & use a very light brown colour to 'fill in' where the white blonde hair is & get definition - but it isn't natural & doesn't look it (i'm a bit colourblind so find make up hard to get right.)
What is Eyebrow Tattooing & is it worth a try??