1 is probably my favorite of the bunch. 12 has potential to be cool if it was more sharply focused.
I went ahead and quickly edited a few.
Concentrate of focus. some of these are soft. Focus is one of the most important aspects of an image. almost everything else can be fixed but if a image is out of focus you're screwed.
Exposure keep an eye on your range. try to narrow the relationship between highlights and shadows. Your pic 13 is a good example. towers are bright but the bottom and right side of the photo is dark and murky.
Also, composition. Watch your lines. fill your frame. take your time and think about what your trying to say and where you're trying to lead the viewers eye. Honestly most of these are simply boring. They snap shots not photos.
keep at it though. I have seen a few people here over the years progress from where you're at to excellent photographers.
the quick edits are merely an example and hopefully will help you look at things differently
You're welcome to shoot me a PM if you have questions.
You can take a look through my posts to see some of my work.
1. (simply crop and exposure adjustment and sharpening)
2. (fill the frame. everything else in the photo was noise. although its still boring IMO)
3. (a little crop and exposure adjustment)
4. (straightened to exemplify watching your lines)