Being a
man, I would like to say that:
Shy girls are nice!
My point is this: A girl who has an element of shyness (or, as SabreCat points out, introversion) in her personality is often more interesting than girls who are too direct. If forced to choose (which I'm not) I would prefer a girl who is a little shy rather than one who is a little direct. A "shyish" girl will be so much more interesting once you start getting to know her. It takes time, but there's more to be found.