Revision Rhinoplasty Post Car Accident?

There are ways to permanently repair notching of the nostril margin, though I would suggest you give it time to allow your nose to heal. At this earlier stage it's hard to get a full sense of what your baseline will be (which could lead to under or over correction). It can take...

It probably will have minimal effect on your nose except for the typical effects it can have on the skin of your face which could include enlarging the blood vessels.

When I first learned rhinoplasty, it was all about remove, remove, remove. Humps were brought down to fit existing tips and tips brought down to match desired profiles. Current rhinoplasty techniques are more about adding to many areas such as the tip of the nose if it is deficient and might...

You need to wait.  There is still a lot of swelling and your nose should continue to improve.  Make sure to continue following up with your surgeon.  

Yes, being your third rhinoplasty, at 4 months from surgery you should have a significant amount of swelling. This is especially the case if there was an infected implant that had to be removed. It will likely take over 12 months for the final result to be evident, probably more in a revision...

Rhinoplasty can be done after surgery is performed to correct a deviated septum. Although oftentimes in rhinoplasty we do use cartilage from the septum for rhinoplasty, if needed, cartilage can be harvested from elsewhere. Sometimes this is from the ear preferably or if quite a bit of cartilage...