I made a 2 to 4 junction to localise the edge loops on the nose, but one of the poles pinches pretty badly. Should I run the edge loops to the forehead and thus put the poles on a flatter area and likely remedy the visible pinching in doing so? Or is there another solution you suggest?
Good question! Try not having that face loop run up and back down the nose, but rather have two of them cross over the center line like so:
It may also be possible to run one around the nostril in the other direction. I don't remember exactly what I did in the video, but it was probably something similar.