It looks like her nose is pushed against glass. And what I mean by modeling is making it seem 3D (like clay modeling) rather than flat. If there was just a bit of shading, I wouldn't be bothered by the ball of the nose at all. Of course you liked how it looked; It was just a criticism.
You shouldn't assume it would just take 2 extra minutes to render something, everyone works differently and at different paces. Also if the rest of face is rendered completely doesn't it make it that more obvious that the unrendered part was a stylistic decision of the artist? You just seem a little off-base here, implying that the part of the nose was done because of laziness/lack of skill.