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 Tuna just because of the illustrations: https://www.pamwishbow.com/client-work/project-four-yjynj-pafyx
I'm right on board with you with Kyle Ferrin. I've spent... a lot of money on Leder Games games.
It's interesting how Kyle Ferrin managed to develop such a unique, recognizable and charming art style that I when I looked at OP's picture, I instantly thought "huh, the art style of the third board game reminds me a lot of Root"
Yeah it's Oath, I bought it, I don't even know if I'll be able to play it with friends, but I need all the Kyle Ferrin I can humanly collect in my life. His cute critters and goofy faces and lovely sketch lines and textures are just so adorable
My first thought was "I've got to share about Root" and then looked closer and thought "they probably already know"