Will Losing Weight in my Face Make my Nose Look Thinner?

Though gaining and losing weight can change the shape of
your face and can thus create the illusion of a difference, losing weight will
not change the size or appearance of your nose. If any changes are realized, it
is because of the fluctuations that are affecting the way your nose looks compared to the rest of your face
(not because of actual changes to the nose). If you are, however, hoping to
make substantial, long-term changes to your nose, a rhinoplasty would be your
best option. I recommend consulting a few surgeons in your area for a more
accurate assessment of whether or not a nose job is a good option for you to
explore.

Weight gain won't change the shape of your nose after a rhinoplasty, however your nose continues to change in shape slightly with the aging process.

       Should not reduce size of tip compared to the rest of the face.  The tip should look larger if the rest of the face loses fat.

Since the nose rarely changes with weight gain or loss, in my experience I would think that it is possible that you may find you have a better proportion between your narrow nose and your new narrow face, making the nose actually look less narrow.

In my opinion, losing weight will not make your nose look more pinched or thinner than it already is.  However, if your excess facial fat had previously been drawing attention away from your nose, then the focus may return to your nose after your face becomes slimmer.