What's a big nose? sure, we can all think of it conceptually, but if I asked you who had a small nose, then it would harder to say. It really does depend on the persons face. Unless it is noticeable disproportionate. I'm looking at peoples sigs and avys and all the girls have varying sizes and shaped noses.
it's really difficult to describe a persons nose. I have found that I am attracted to a particular kind of nose, but it's only because I happened to notice that all the chicks I really like all have similar facial features. If you asked me what my perfect woman looked like, bring in a damn sketch artist and for the life of me I couldn't tell you.