Where to inject botox to stop the nose from pointing down when smiling?

I have always had an issue with my nose. It points down a lot when I smile, and so last year I had botox injected right under the columella and then 2 on either side of the nostrils. A few days later I looked so awkward smiling it was embarrassing. I looked as if I was really struggling to smile. However, it did stop my nose from moving. I would like to ask if that was the correct way to do it or if there is another way that I can achieve a non-moving nose and still keep my smile? Thank you :)