Work on compositional placement first before the rest of the technical areas such as exposure, focal length, etc. Almost all of these photos are centered.
If you could, please number your photos in the threads you create so we can reference them easier as well. The second to last photo has a lot of dead space to the left not contributing to the photo in any regard and the subject is so close to the edge looking out of frame. A photo tells a story (or it should). What would be the story here? Perhaps if there were some creepy looking dude OOF in the dead space, the subject being close to the edge may actually work as it could convey the message he is trying to get away from the "weirdo". I hope I'm not confusing anyone.
Generally if you have space in the photo, you want the subject gazing in the direction (if you're into having the subject not looking directly at the camera such as I do).
Also, I noticed a lot of the horizons are angled in these shots. If this is something you're going for, make sure that the photo becomes enhanced by doing so. While others may disagree, I do actually like the tilted horizon for photo two. This is the best photo in this thread. Keep shooting, you already do better people photography than I do. I just can't seem to do humans justice. I suppose I just need to practice. If you practice more, I will practice more.
Thank you for sharing these with us. Good luck in your further progression.