Realistic nose job expectations? (Photo)

I've always been told I had a big nose. I'd really like to change my bulbous tip. The top of my nose is too round and large. I'm not sure what this type of nose is called, I've never really seen it on anyone. Is it also possible to make my nostrils straighter? As you can see from the side view, they sort of curl out and then inwards.

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