Starting with the dress. This dress is from dELiAs. I think it could make ANYONE look curvy and sexy even if they didn't have curves and if you had a little bit more curve than you want it could hide it!
Black accessories: Shoes, bag, bra. just make you (or atleast me) feel like Woah! I'm wearing really high heels... watch out =] lol
The Hair: Keeps it off the neck and is slightly tousled making the "i'm to impeccable" feel go away (since you are matchy matchy with the accessories.
THEN... the earrings: I love a good green stone. Since Angelina Jolie wore the humongous emerald earrings I have been in love with what they do to a look. They make the look still mysterious, but with a POP of color.