It takes 6-12 months to get the final result following any type of surgery so it is possible that it will improve with time. At the same time it is possible that the closure may have effected the internal or external nasal valves. Scarring or distortion in these areas may decrease air flow. The fact that you see one nostril being significantly smaller than the other would also suggest that this may be the problem. Talk to your doctor about the problem and what can be done to improve it, and if you're not satisfied with the options or the result, it doesn't hurt to see another doctor for a second opinion. Good luck.