Yeah, agree with most people so far, wheels just look too small on it.
My personal thing for balancing proportions, the space from the bottom of the wheel well arch to the top of the tire should always be equal or less than the height of the top of the tire to the top of the rim (sidewall height). When there is a bigger gap, it just looks funny and unbalanced (go walk across the street from your work and look at the new standard wheelbase Escalade with 20" rims, the tires are like an inch thick with a 4 inch space above them, looks so hideous)
So, I would prefer an inch bigger (they look like 16" from that pic, but it could be the angle) and def lower it.
EDIT:: Here, see what I'm talking about?
Now go find one on the roads thats lowered about 2". Night and day difference.