How can I reduce exposed nostril size with filler? (photos)

 The photographs demonstrate a hanging columella which can be reduced with a columella-plasty.  This will also help hide the visible open rhinoplasty scar present.  To actually bring the alar rims down will require a composite graft of both skin and cartilage from the ear when there is true alar retraction present

The retraction of your nostril rim can be lowered with fillers but I suggest you consider small alar rim cartilage grafts which would permanently correct the unwanted nostril exposure.