Again a belt, or Maybe a fabric sash from another dress. It's a pretty idea of dress, but needs something at the waist, so it shows a bit more of your nice shape.
I think a prettier color would make a world of difference in this. The gray is pretty drab. You're fair skinned, so a dark, saturated color would look good. Navy blue, Deep maroon, Hunter green, etc. I think the details would show up more, too.