There are many details about noses; highlights, creases, skin issues etc. Please, forget beauty ideals - people with long, hooked noses are pretty, too.
Since noses are sticking out, they are the first to be injured, cut, or sunburnt. Broken noses are lopsided and knobbly. Rough or old skin shows with large pores. There's often a dip in the tip where the cartilages meet.
Also check out *ConceptCookie
's nose tutorial, it's very well done.
"Ranarh's tiny tips" is a collection of iddy-biddy tutorials, each containing small bites of advice anyone can chew, aimed at beginner's level artists. They are not software-dependent. If there's a problem you have, something you feel someone should finally explain, or are just curious what I have to say on a particular artistic matter, feel free to tell me.