I highly recommend Xenoblade Chronicles Definitive Edition. Every environment is just so vast and pretty, especially Gaur Plain and esp Satorl Marsh at night
Astral Chain's cell-shaded art style is very aesthetically pleasing too imo, it's on the futuristic side of things though
Monster Hunter Rise because l like the areas and l just like mh in general even though this mh game has bad soundtrack. But it's also beautiful because the armor details and weapon details plus monsters.
If you like pixel art, Stardew Valley is also very beautiful.
I haven't played Miitopia on Switch, but I played it on 3DS, and the Switch version looks like it's the same, just in HD and with a little added content, and some of the areas in the game are really quite beautiful, I think.
Mario Kart 8 also has some really beautiful environments, just you might not be able to get a good look at them while you're racing. But if you take the time to just drive around the courses slowly, you can see some very nice scenery.
Pokémon Sword/Shield are also quite beautiful.
I think all of these games also have the benefit of being very fun.
A rather short, simple game, but quite beautiful was My Brother Rabbit. There is no dialogue, everything's conveyed through image bubbles.
The soundtrack is nice, and iirc, the backgrounds are hand drawn. In gameplay, it reminded me of The Tiny Bang Story. HOs, puzzles, and piecing things together.
Breath of the Wild is probably the only game to this day that still blows me away. I still couldn't believe how it became possible on Switch to have that kind of graphics. Guess, it's because of the amazing art style.
Mario games are always beautiful to look at. Mario+Rabbids, Super Mario Odyssey, Luigi's Mansion 3 to name a few.
Dragon Quest XI S is okay, if you don't have any other console (or PC) to play other than Switch, but I don't like it personally. lol. I'm honestly still mad that they just ported the Switch version on PS/Xbox consoles. While playing it on Series X made the graphics/performance miles better than the former, it could have been much better if SE weren't lazy lol.
Anyway, if I'm going to look for beautiful games on Switch, I'd first look on Nintendo's first-party exclusives and nothing else.
Dragon Quest 11 Definitive Edition gets my pick. Even though it’s scaled down, there’s still a ton of detail in the characters and environments. It almost looks like an animated movie at times. The only thing holding it back visually is the resolution. Like most Switch ports it varies between 720p and 1080p while docked. As a result the game can sometimes look a little blurry. Otherwise Dragon Quest 11 is a technical marvel for the Switch.
I haven't played it, but Gris has kind of a hand drawn aesthetic somewhat similar to Spiritfarer. It's not exactly the same style but it seems adjacent. The game is about grief/trauma, which should be mentioned as a disclaimer.
Old Man's Journey and Abzu are two others that are short but very artistic. There's not much gameplay to them, they are just basically navigating very picturesque settings.
I really loved A Short Hike. It's all outdoors and but very stylized/picturesque nature stuff.
