I also can't have put it any better then
Jiffie did in how
he replied...
Just a little nitpick here,

but I'm a woman!
As for Jeremy, I guess it's the hair. I haven't played the wedding DLC yet but I'm wondering what the thinking was behind that change - seems like quite a downgrade, and makes him look less unique as a character than his younger self.
The reply above beat me to it, but, yeah, Jeremy wears this hair in his main game, XOXO Droplets, I think it's the art style messing with you (I felt the same), this artist is more "round" and "Thick", which amplifies "baby" qualities if they're not a long and slim square jaw sprite.
Though, I do think Jeremy looked more mature than that photo, to when he was shown in
the phone call chat with Shilo, Shilo, too, something about these new "mature" (I think they should be about 18-19 by now, maybe 20, forgot our age, they're a year or 2 younger than us, I believe) sprites is giving off a chibi/baby vibe, even younger than when you see Shilo in step 3. Oddly enough, they both kind of look like Dexter sporting different color schemes? I dunno, I like them, but something about them seems a lot different than how they originally looked, and not in the way they were supposed to by age affect.
Other than that, I think Shilo got cuter, the blond and the haircut really suits him, to me (the hair style, most definitely, the blond just because it fits his
"influencer" personality), and I have to say, Jeremy is not as attractive as when he was seen
on the phone; I think that was the most attractive Jeremy had been, not even in his own game. The art is phenomenal, but the fashion/hair/bone structure/aesthetics is a miss for me; Jeremy's hair (could be longer, or slicked back; the "waves/curls" seems awkward on him, at this length, somehow) and Shilo's dumb hat (didn't think anything could be worse than a cheap fedora, but I stand corrected!), it was cute when he was little, a bit obnoxious, like wearing a baby bonnet, now.