Best Looking in what category ? In term of Artistically or Realistically (realism)

Cuphead still has the most charming and unique artstyle imo.

When it comes to graphics in function of gameplay (graphics that make the game more pleasant to play), Breath of the Wild is by far the most beautiful open world game ever.

Whichever you prefer. You can do both if you like.

Zelda Breath of The Wild   in terms of artstyle 

Wolfenstein 2: The Colossus in terms of  realism 

Probably Cuphead, I just love the visual style of that game.

Of course BotW is also lovley with its Ghibliesque visual style

Still Breath of the Wild for me. Not only is it gorgeous but the art style won't be outdated anytime soon. As a game artist it's a standard I'm trying to get myself to within the next few years.

From What I owned.
BOTW still takes the cake!

What are the four?

I’m inclined to agree. The huge open areas, looking over vast distances from high places really makes the game quite breathtaking. Also all the beautiful landscapes to get right into and explore.

Yep! I am actually hoping Nintendo can make a new RPG (New or old IP) and use the same art style as BOTW.