What risks are involved with eyebrow piercing?

There are very little risks with getting your eyebrow pierced if you take care of it. Your face CANNOT be paralyzed from an eyebrow piercing, it should never be deep enough to disturb any nerves, and again, if you take care of your piercing, it shouldn't reject. It may migrate a little, but you can have it for years and years.
Like any other peircing there is a sharp pain when it happens but honestly its hardly noticable and worth it.