The lighting in this painting is interesting, because it's almost like it's coming from every direction, which feels a bit overwhelming. Like look at the shadow at her feet.
Similarly, she's in the center of the painting--she's like at the center of view and seems more exposed than anyone else.
People are also sort of 'coming from every direction' or they could see her--some are looking and some are not, but they could look at her.
The men are much more physically covered too, and not exposed. They are wearing hats and their coats are closed, and pants covering their legs.
She is wearing a long coat too, but it shows a colorful red dress, and a hand that is reaching out perhaps in search of someone else's hand, or to cover her abdomen. She also shows much more emotion, whereas the men around her in every direction appear more guarded and as if they are only showing they are looking at her at times.
So it looks lonely, and it looks overwhelming.
Red was also a color that signified scandal in the past, or passion--red like the blood that supposedly came from the hymen after loss of virginity. Red takes on an extra sexual meaning for women, though in general it's somewhat linked to passion and blood in general.
So again, she's wearing this bright red, and the people everywhere, overwhelming her with their neutral, heavily armored staring. Idk
She also just looks like how I feel in busy places like that! lol I am not a fan of busy train stations and city subways. Maybe it's a comment about urbanism and how lonely cities can feel, even though there are more people packed into them.