Will I look different after nasal valve collapse surgery?

It doesn't sound like you are having a rhinoplasty rather functional reconstruction of the nose.  The answer to your question will depend on whether your surgeon is repairing collapse of the internal or external nasal valves.  In either case, some fullness in the area of repair can be expected as the idea of nasal valve repair is to provide not only structure to the weak nasal cartilages, but to also increase the cross sectional area of the nasal valves which would slightly increase the size of the nasal valve area reflected in the appearance of the external parts of the nose.

It sounds like you are describing internal nasal valve collapse, and correction with spreader grafts.  This would be considered the "gold-standard" treatment for this problems.  I counsel my patients that I do expect a mild change in appearance, with a slight increase width in the middle third of the nose.  In patients with internal nasal valve collapse, this area can look "pinched" with an hourglass shape, so often this subtle increase in width is actually aesthetically pleasing, creating a more smooth contour from the medial brow to the tip of the nose without pinching.  Best Wishes

In general, there are very little changes that occur cosmetically during nasal valve surgery. The changes that do occur actually can make the nose look better and more symmetric. The middle third of the nose can look slightly indented with internal valve collapse. Spreader grafts actually improve this narrowing and make the dorsum look straighter. (From what you describe, it sounds like your surgeon is planning spreader grafts.)

This question is almost impossible to answer as it very much depends on the starting point of your nose, the problem you have, the procedure being performed, and the skill level of your surgeon. Generally, however, a rhinoplasty for nasal valve repair will always lead to minor cosmetic changes/improvements. By definition, a rhinoplasty will slightly alter the shape of your nose. That said, such changes can be very minimal and barely perceptible, or they can be rather noticeable if so desired. Good luck!

There is usually a reason for narrowing of the internal nasal valve such as trauma or previous rhinoplasty surgery.  There are a number of was to reconstruct the internal nasal valve and almost every technique will change the shape of your nose in some way.  It is important that you stress your concerns to the surgeon to ensure the changes to your nose are limited.  In most cases the change to the external appearance of your nose will be minimal unless the deformity is severe.