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You have a lot of sharp images and interesting subjects in this set.
As for constructive criticism, the main things I see are compositions and backgrounds.
#1 There is another person behind this lady. Just scroll the image on your screen until that person is mostly hidden. Look better? The microphone is another problem, and hard to fix. Objects often look better if they are not cut off, like the microphone is.
#2 It's a good view of his face and hair. Again behind your subject is a distraction - another person. In this case you might want to clone out that person carefully. The microphone in front is again a small problem that is hard to deal with. Show the instrument in full, rather than cutting off the end of it with you composition.
#3 I would have "aimed" further to my right for this shot and included her shoulder. The person on our left side would then be hidden - a good thing.
#4. Nice shot of this guy. But get rid of the bright light distraction behind him. It competes with his face for attention. Crop just at the top of his head and it will be gone. You might want to crop the bottom, just below his elbow too.
#5. She is exposed very well, but we can't see her hands. You need to have them in the picture.
#6. Another shot that looks good, but this time you aimed too far to your right. You need her hair in the photo more than the empty space in front of her.
What is causing you to miss these compositions? Could it be putting your focus point on your point of focus and not noticing the edges?
#7 Wonderful shot is some ways, but again you missed having them all in the frame.
Keep at the compositions. Once you start thinking about them and notice the edges of your frame, you'll get better results.