I wasn't blessed with thick eyebrows so I have to fill in the sparse areas with an eyebrow pencil. The problem I had was, at the end of the day, most of the eyebrow pencil had worn off. I solved this by spraying a small amount of hairspray on my finger and then dabbing it on my eyebrows quickly before it dried. Now I have eyebrows all day long!
This is a page about using eyebrow stencils. Having beautifully shaped eyebrows helps accentuate your eyes.