Resident Evil Revelations.
I don't care that you excluded it. It's a beautiful game and it deserves the praise.
Other than that, I'm going to say Pilotwings resort. On a technical level, it's generally simplistic, but it's one of the best showcases of the 3D feature. I still play it now and then, primarily for the visuals, and that's not something I can say about a lot of games.
Kingdom Hearts DDD is a great looking game. Sticker Star for its faults is very pretty as the art style works well in 3D. Kid Icarus Uprising is also quite good. And, Luigi's mansion.
And... Xenoblade Chronicles. I mean, it sort of looks ugly, but at the same time, it's super impressive that they got the game to run on the 3DS in a relatively uncompromised form. The game was already pushing the limits of the Wii.







