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#1 has the subject leaning in, and with engaging eye contact (although eyes are not well lit). She also has the closest thing to a smile (i.e. welcoming expression) of the others and her hand placement is not blocking her face. I also like the emulation of the oncoming train light. The flare is a little tough, but that is artistic rendering, so I'm good with it. Her pose has lines that help bring you up toward her face from the bottom of the frame. Many good things here, but when you arrive at the expression, it becomes a bit of a let-down as her mood shows through.
#2 Her body positioning has her accentuating her midsection, as the foreshortening also emphasized her leg/knee. The hand positioning blocks her face, and again the mood. The landscape orientation also advances the wider perceptions.
#3 I kinda like this one and think it would benefit from a different crop. Not crazy about the finger in the mouth thing, but at least it isn't her entire hand blocking so much of her face.
#4 I am a big fan of foreshortening effect in foreground landscapes, etc. ... BUT, the foreshortening effect here has done her no favors. Her head is tiny compared to her legs and shoulders, very unnatural.
#5 Another one that I'd like to see with a different crop and better mood. I get the attempt at pensive look, but she winds up in "no man's land" with the evoking of her mood ... as in no man better land in her way cause she's gonna kick you a$$ if you do. She looks well prepared for Sugar Ray Leonard, Muhammad Ali or some thug from Deliverance, due to her clinched fists and leveled forearms. Of course, if that was your intent ...
In general, her mood comes across to diminish what could otherwise be some nice pics. The posing, hand obstructions, foreshortening, etc. serve as detractors rather than enhancers. I get that not everyone is "model material" ... which makes a study and utilization of technique all the more important.
But, that being said ... the MOOD is the killer part. A great mood will cover a multitude of sins, but all the great technique in the world pales in comparison to a poor mood. Maybe you have others that would augment these such that they would present better as "the many sides of". As is, they stand to present her as a grumpy girl ... or at least, proceed with caution. If that was the intent, then I'm good with it, but without any indication that your goal was such, we're left to assume you were shooting for something else. I could possibly go with 1,3,5 for various reasons (with crops, etc.), if it's all I had, but first impressions have been as noted.
My .02 ... hope it helps ... looking forward to see more, as we encourage growth / learning. I'd suggest getting some good portrait reference material and compare it to your pics and our comments. We (some of us) aren't all portrait photographers, but still aspire to help.