Is this rib cartilage sticking out in my nose? (photos)

That's a really difficult answer to give based on that picture. I know those close-up pictures are challenging.Definitely see your surgeon for their evaluation as they know your nose best and can tell you definitively in a matter of minutes.

It is exposed cartilage that if you had rib inserted, it likely is that. The important question is whether that rib if donor banked rib or is it your rib harvested and used. The management may need to be more aggressive if this is banked cartilage. Best Wishes!!