I like the idea of a romantic, girly dress for al fresco dining. Somehow the little flowers at the neckline of the dress seem appropriate for dinner under the stars. If I am wearing a frilly dress, I like to balance it with accessories that have very definite shapes to them. (See the earrings above).
Since the dress and the heels are both blush tones, try a clutch in a darker, richer color. The ring with the red stones helps to add a little pop of color to the ensemble as well.