Nostril asymmetry is really quite common in all individuals. Since we don't have your pre op pictures, it's hard to evaluate but I always stress to my patients that this can occur. Regarding the tip asymmetry, this doesn't look like swelling to me, though I can't be sure. Again, without seeing your prep pictures and knowing exactly what was done, it's really hard to evaluate. You really need to discuss these concerns with your surgeon. It's way to early to consider revision surgery but if the problem does not resolve a revision can always be considered. In my practice, we nearly alway recommend waiting at least 6 months before even considering revision.