Maybe it's just me but I find some of the characters, especially dark, brown, hispanic characters are a bit samey looking. Without their clothes or signature hairstyle on it's hard to distinguish them. At first I confused Farah with Brenda until I noticed Brenda by the MC's side. If not for the bangles I won't even realize it was Farah. The trio in the middle that I marked are also eludes me, unless ofc one is the model that jogs in the park and the other two aren't in the game yet. Also the church twins and the history teaches are related? Big if true.
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Hm, I mean they're all drawn in the same art style, so there's gonna be some similarities, and this image is quite zoomed out so it's hard to see the smaller details, but the characters are all designed to look quite different from each other as much as possible.
Amira (I think you got the name confused with Farah, not sure if that's from another game or something) does have a similar skin tone to Brenda, but Brenda is quite a bit taller and has much smaller breasts, they have different hair colors/lengths/styles, different nose shapes, different builds altogether (aside form being hyper-curvy which is just something I do)
Same can be said for the Freeman sisters, the black girls in the upper left touching each other. Chiwa has lighter skin, they have different hair textures and styles, different builds (Chiwa has big boobs and has an hourglass figure, Oluchi has smaller boobs and is pear-shaped).
The trio you highlighted int he middle are all related - Arianna, Sofia, and Sofia's daughter Sifa - so there's gonna be similarities between them. Everyone in the image is in game, also, just some only appear in the school update thus far, though you do meet Sifa in the grocery store when doing the laundry quest as well.
TLDR just that first paragraph, the rest is me just pointing out specifics haha