I've done a similar hair style before...you kind of pull chunks of hair back piece by piece, until it sort of looks like it is in a very loose ponytail by using bobby pins to hold each chunk back... then I take the whole handful of gathered hair (now pinned back and up a little) and kinda of smoosh it into my head and pin (in the shape of a star almost) the curls to my head...I don't know if I'm explaining right, but what I get is an loose updo/curly bun kinda thing like that picture...
2b/3a/3b botticelli curls, medium fine, medium coarse

Photos: http://www.fotki.com/joliecurls