What could be done to change the overexposed nostrils? (Photo)

Though you have asked several different questions I will focus on your nostril question as there is a definitive solution to your question.  You have some alar retraction from the photo that you have provided.  I suspect that there is also a bit of hanging columella as well.  Surgically you will probably be very happy with alar rim grafts and some elevation of the medial crura with septo columella sutures.  An experienced rhinopasty surgeon can demonstrate these changes using computer imaging.  Best of luck!

Based on your singular profile photo, you appear to have a hanging columella with excessive nostril show. Have you had previous nasal surgery? If not, rhinoplasty techniques may be considered for reducing the amount of nostril show associated with the hanging columella. Thank you for this question. Sincerely, Dr. Joseph

Hi. Thank you for your question. It's very difficult to give recommendation base on one photo. It seems that you might be benefit from chin filler. Be sure to see an injection expert for an in person assessment. 

The photograph is rather limited, however  it is difficult to tell whether not there is a hanging columella present or retracted nostrils, or both. A columella-plasty accomplishes bringing in the columella in relationship to the nostrils. Nostril retraction is best treated with composite skin/ cartilage grafts harvested from the ear. For more information and many before-and-after examples, please see the link and the video below

Hi, thank you for your question it is hard to tell much from one photo, a lot of factors contribute to the nasal flare. Smile muscles can cause the nostrils to flare, even after some of the surgeries you might be interested in reading more about such as alar base reduction.Flared nostrils surgery corrects nostril flaring for static facial expressions. If the flared nose is due to nasal tip cartilage, a tip rhinoplasty can be done. Seek a trained plastic surgeon in your area for better advice.

Hope this helps