Alex looks barely out of college here, I know her model hasn't changed much. However, I think the styling upsells her young looking features. Unsure if that is good or bad.
Celeste having a cut to her braids is nice, the bleach hay/blonde looks a bit on the faked/bottle blonde side. Shirt in the upper sleeve area is so baggy. It doesn't have to be skin tight, but also that is more like sweat clothes baggy instead of going out shirt baggy.
Gracie's hair feels a bit too voluminous and long, I like her loose braids, but I also wonder if someone who is so much in nature is going to have hair that long and so easy to snag on branches.
Lillian is fine with no fucks given and lazy, but she took time to dye her hair. That seems opposite of lazy, no fucks given. I do wonder why she is using the color that has always been associated to Serra, though.
Serra I would have never guessed it was her since she lost her Asian look which was pretty defining to her, with also removing her "friendo" quirkiness, I have to wonder if this is Serra anymore or just a different character with the same name, that would be better off named something else.
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One thing I hope most games take on is how TP: The Class Next Door has characters change outfits almost every day. Like normal people do, which unlike most VN's don't.
Anyway, keep doing what you are doing.