I don't think it really changed? I think the artist has just been honing their skills over the last 100 chapters. I'm used to art getting noticeably worse over time as the need to meet deadlines starts to crush and artists ability to maintain quality, or seeing an entirely different artist take over a story, but this hasn't lost any quality at all over time. At least that's my perception of it.
I get what you mean. Especially the eyes changed, now they're bigger and let's say more expressive. I don't dislike it, but it feels like they're aging backwards. Normally big eyes in there styles mean youth (not that our characters are that old but if I remember correctly they should be near their thirties) so it's can feel weird. But I must say that it's not a bad thing, because it can show that the characters are still growing emotionally. Especially Ines, she went from resting bitch face to the smile of a young girl in love. With Escalante it shows his puppy love for Ines. And so with bigger eyes they can add more details and so show more expressions.
the art changed :(