you could use a straightener to this . just dont curl all your hair from the scalp and do it quickly? if that makes sense.. o.o
It's definitely possible to have wavy hair (I do, and I am Asian). However, I don't think the girl in the pic has naturally wavy hair like that. The curls are just too well positioned. Even if she does have wavy hair, I am sure they had to put it in rollers, straighten certain parts, etc. to get it exactly like that.