I like the art style overall. But I'm not blown away like I was with Wind Waker Twilight Princess (on GameCube). I just hope they'll had some detail to the environment, because they look flat as of now. I really appreciate the blurring in the distance occuring. As has ben pointed out already, it makes it look like a watercolor painting.
Link's model is really good too.
Not really fond of the enemies new designs though. They kind of look bland compared to what was in Wind Waker.
If it was me, I would have gone for a Wind Waker art style, but with adult Link and a darker color palette (as in: no exagerated and over-saturated primary colors.).
But of course, the game's still a long way to go, so I'm sure they'll improve what they've already laid out.