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
Harmonies is pretty and very very inviting for non-gamers.
Small World always stood out to me as a game with lots of style and identity.
Glory to Rome, in the crazy, all-in reprint they did still to me is an absolute highlight of art and theme. So pretty.