Seek out a number of opinions
The use of nasal fillers in the nose is a relatively new procedure and most doctors are still relatively conservative about its use. In regards to the tip, depending on what you are seeking to achieve you may find that surgery is the best long term answer for you.
WIth regards to fillers, seek out people who have a lot of experience with their use. Here in LA, Dr ALexander RIvkin was one of the pioneers and has a very large experience with the use of fillers in the nose.
Hope this helps. As...