I have been struggling with Al Pacino's nose for what feels like a really long time now.
It is a difficult nose and makes me wish everyone were symmetrical like lovely De Niro.
Looking at the nose now that I've scanned it in, it doesn't look quite as bad as I feared. I think it might be salvagable.
The lesson learned from this is when you want to throw the whole drawing away - Don't! Give it a little while (or overnight) and re-evaluate later.