I loved both the art style and music very much! The new art style is actually my favorite of all, and I think it fits the series quite well. I actually had some doubts initially, but those evaporated fairly early on and then after experiencing the game, I thought it was incredible and rather lovely, with cute characters. The painterly aspect of it was great, and in my opinion it was well done. Faron woods had to be my favorite display of the art style as I loved the look of the dappled sunshine on the ground coming through the trees and such. I found myself wishing to see what other types of areas would have looked like with the new style, too. It's too bad we didn't get to see the world below during nighttime, since I think the look would have been very pretty.
As for the music, well, again I had a few small doubts at first but those didn't last very long at all. I think this game in particular is one where the music was very well done to fit with each situation and area quite well. I just think it did a great job at setting the mood in every instance, and I have many favorite songs among them all. Fi's Theme in particular would be among the ranks of my favorite Zelda songs in general, actually.
So, yes... I really loved the music and art, and I think they both worked perfectly with the game to make it great. :>