Anything from Leader Games and illustrated by Kyle Ferrin (Root, Oath, Fort...) feels like cheating but still, I absolutely adore their art style
Everdell, Photosynthesis, Parks, look nice as well
I also bought an updated edition of Costa Ruana just because of the illustrations: https://www.pamwishbow.com/client-work/project-four-yjynj-pafyx
Brass: Birmingham - the art quality and dark Victorian aesthetic of the board and cards are evocative of the early industrial revolution. This game also gets the "most improved" award, when compared to the original edition. The add-on iron clays are fantastic. The other components are very average though.
War of the Ring - beautifully painted over-sized cards
Pax Pamir: top notch, unique components and a cool cloth board, but the card design could be better.
Everdell for the card art, of course. They give you the feeling that there is a story behind the game.
Beyond the Sun. Just kidding. It's a great game but the art is pretty much non-existent.
There is only one edition of Brass: Birmingham. Are you thinking of Brass: Lancashire?
Could be. I've seen a copy the original one, which may have just been called Brass. I can't quite recall.