If that girl on the top looks familiar, it's because she's Dree Hemingway. Yes, the model. Let's all be jealous of her adorable scarf and cropped tuxedo together. As for the girls on the second row, I love the way they both use a touch of (faux?) fur to elevate a mostly black outfit. Black tights/skinny pants, a boxy coat, and a fur hat/collar is such a cute winter outfit (the collar option is probably more wearable, but still). Plus, adding a fur accessory (eBay has a bunch of faux fur) adds a sense of luxury to H&M or Forever 21 basic pieces--it's the perfect example of high-low mixing.
Dree Hemingway: jakandjil.com/blog
Girl with fur hat: garancedore.fr/en
Girl with fur collar: garancedore.fr/en