Probably JackJeanne!
I've played a lot of otome games with beautiful character art since I was young, like Amnesia and CollarxMalice, illustrated by Mai Hanamura. I love her gorgeous arts.
So when I bought JackJeanne on switch and first started playing, I was honestly shocked by the character sprites. I thought, "Why do they look so simple?!"
But as I kept playing and saw more and more CGs, I completely changed my mind. It's such a cute and heartwarming story with an amazing cast of characters. Even the characters you can't romance get several CGs of their own. There are also CGs showing the whole cast performing together, which really made me feel how much love Sui Ishida put into every single character.
Thank you so much, Sui Ishida-sensei!
(Though I guess you can really tell that manga artists aren't used to drawing visual novel sprites, lol.)