I'd say the art is exceptional, significantly better than the majority of Games/VN that are just reusing the same "Daz"/"Honey select" assets.
I think the main criticism you have it that the art isn't attempting to be Photo realistic like many others, but I don't think that is a bad thing, art IMO shouldn't copy life, it should represent it and I think the artist has succeeded in doing this.
The characters feel like real people with real flaws and real emotions, rather than glassy eyed barbie dolls.
As this game progresses I feel more and more attached to the characters, I think I'm a little bit in love with Mrs Loveday, something that never really happens with the characters made with the more common assets, with them you tend to like them from the start or you never like them, here flowing emotions shown in her face and body language is almost hypnotic, it really gives her life. draws me in.