I get that the artstyle for this is quite a bit different to the art in the actual games. But what part of it gives away that its AI? I'm not 100% sure that it is AI. I think it definitely could be generated because something about it feels off, maybe the smooth lighting and edges, but I dont want to say it just in case.
Light/shading is the most typical AI, for starters
second, the "finger socks" that nobody would draw out of their own volition unless they were transparent stockings on a heavily feet-focused piece, which this one isnt, and even at in such a case, i rarely see stockings/socks "fit" to the fingers SO HARD, but AI often does such a mistake
third, Hana is, for some bizzarre reason, grabbing the broom with her fingertips instead of well, the whole hand like a normal person would, even more so if you are FLYING on it, and this is because FE just AI-generated an "all fours" Hana, and then just layered the broom under her
fourth, their off-arm is nowhere to be seen, kinda weird to "pretend that they are both positioned on their chest in the exact same way and thus can't be seen, and for some reason the girls flying in brooms have no interest on grabbing their unstable vehicle's with both hands"
and last, aiko's right hand goes absolutely nowhere, when it should, at the verye least, be grabbing the broom, with her elbow flexed instead of extended, most likely because she was also just generateed on a kneeling position, and then layered there