Most of the guys I know (including myself) like girls with glasses. It makes them look bookish (ie, librarian) and more intelligent. Sadly, that’s not always the case.
There are some blondes I like, as well as red-heads, but only the darker ones. I’ve always loved dark hair, especially if it’s straight or slightly wavy. Long is good, but short and pixie-ish can be maddening as well.