That is a beautiful dress! But everyone is right, it DOES need something in the front.... somehow I can't really picture a sash other than those stupid beauty pageant ones... so I was thinking something like a beltish thing that meets in a downward V thing at the front and back, with a long ribbon going down to the bottom of the dress (since to me the style is almost medieval, but this picture is supposedly elven... same thing in my mind
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And a corset with it would be hot!
Necklace to fill in the neckline a little, and maybe instead of a metal/gem tiara, you could do a headband of white flowers?