I think a nose piercing is like any other addition to your appearance - it may suit you, it may not.
I think for Western women, the point to take into account is the shape of your nose.
A lot of Asian women have beautiful aqualine noses, and a stud or piercing looks attractive.
Quite a lot of Western women have noses that are utterly unsuitable to piercing, and piercing only adds attention to an already less attractive feature.
So, have an objective look at your face, and figure out if a piercing will really enhance your appearance - to you, not to anyone else, you have to see it in the mirror every day.
But bear in mind, the are an eastern accoutrement for a good reason - Western noses often don't suit them.
Good luck with your choice.