To add to this, the changes to take this to the next level: raise the dress so the front horizontal strap is even with the bottom of the breasts, tighten up the straps to match that new position, and take the dress in along the line where the horizontal strap is located so it is fitted, but not snug. I think that will get you closer to the intended look for that dress. I would say you’re looking for the same level of fitting as in the second link you provided, but even the first one looks a little more fitted than OP’s.