Okay, you've got a good eye. My personal opinion is that it could be refined though, as all artists can.
First of all, I would like to see better focus in your images. Some of them are better than others and I know that it is hard to focus properly when shooting yourself but it is possible (I do self photography all the time). The best thing is to invest in a tripod and that will allow you to set yourself up a little farther away from the camera and use a timer. A tripod is one of the single best things to use as a photographer and you can use it until it breaks so it is worth the money. Also, you can try to shoot with a smaller aperture which will give you more depth of field and a better chance that what you're shooting (you) will be in focus.
From the quality I'm going to say that it looks like you are shooting with a point and shoot camera. Am I correct? You should see if you can change the ISO that your camera is using and this will minimize the grain. It's usually somewhere in the menu but I can't tell you exactly where. This will force you to use slower exposures and a tripod will help alot with that as well. Overall your photos will look much better though.
As far as composition goes, try experimenting with the framing so that you are not always centered. This will make your photos look more like art and less like pictures. Also, try very hard not to put light things in corners. This is happening consistently in your photos, partly because of where your hair is or where your head is. It is hard to avoid this when you are shooting but that doesn't mean that you can't crop your photos in photoshop or something similar. The idea is that this distracts the eye from what is important about the picture.
The subway photo is probably your best. If you look at that one compared to the other ones you can see a difference in composition. Your face is not really centered and you also have lines that are leading the eyes to your face. This is why it is more apealing to the eye so practice trying things like that.
Sorry, if you know all of this but I'm unfamiliar with your work so I figured I should say it. Personally I like people telling me these things because they will help you more than simply saying that I like it. Continue posting, I look forward to seeing you progress!
