I think first and foremost, it needs a grille with a single bar running across to match the rest of the lineup.

In general there's very little adorning it and it looks kind of plain. I'd guess the overall shape is essentially finalized so there's not much that can be done in that regard. At least give it a little more brightwork. Some more chrome accents could actually class it up a bit. Hell, a freakin VW Jetta or Passat has more chrome than this thing. The bumpers and side skirts could also be made to look a bit more interesting. The car would still be pretty bland, but at least it would be less bland than it is right now.