I actually like the flare in #1.
#2 doesn't do much for me subject wise. However, I've seen people take photos of different letters like that and sell them for a couple bucks each. People buy them to spell out words in an interesting way.
#3 is quite nice. I like the contrasting colors.
#4 I agree that you should have focused on the foremost part of the rail. Otherwise, I like the composition.
#5 The top right corner is blown out. But I think the only way you could have prevented that would be to do an HDR or have lots of external lights to work with.
#6 stake about two or three steps back so her head and hand are not cut off. Either focus on her eyes, or the ball, not her shirt, lol.
#7 Blown sky. Someone already mentioned how to fix it, so I won't repeat.
All in all, these are above average for a beginner. Especially if this is your first camera of any kind. Read up on exposure and composition (I think you've got composition pretty good, but it's good to know why your composition works). Good work!