timotoby, you've gotten two very good replies so far, both with solid advice. Here's yet another one that may do nothing but add confusion, but I hope not. I think we all use different avenues for "inspiration". The suggestion of viewing YouTube for lighting ideas and "help" is spot on! It's an unending source of information. A magazine for ideas, yeah that can be good also, to a point, but be careful which ones you put your faith into! lol.
Now, these posted images? Take my advice with a grain of salt as I too am a relative "newbie" in the portrait game after 20+yrs shooting strictly motorsports. The only thing that "bothers" me in the first shot is the crop, cutting off her left arm. If you were going for the "flat" look, which works for me with this pose and her facial expression, you nailed it! The "up the nose" angle bugs a lot of people, but IMO, it can work at times, but I wouldn't make a habit of it. A slight head tilt toward the camera, and turn of her head toward camera left would've set this one off, again IMO, and I'm as guilty as anyone of the "up the nose" shot, usually when just trying to be "different", lol.
Second shot?? Not my style, but man I like it! Good execution!
Now number 3??!!! It's hard to dislike anything about this angle! lol. If anything, her eyes are cut too far camera right. I would have asked her to look into or just above the camera.
The "random" comments may be accurate, but to me, this set demonstrates diversity. Kudos!
It doesn't matter how great your images are to some, there will be some that will not like them, and may even "nitpick" due their own insecurities (Not a shot at anyone! lol Just don't want the OP to get discouraged). Take any CC on a public forum as lightly as possible and use it to maybe go outside your comfort zone from time to time. Other than that brother, keep shooting, and keep doing your thing!