Nice photos! You've got great subjects in all of them!
One thing you will notice, overtime, is that your technique will change, especially as you learn other methods of composing and post processing. Keep practicing!
My suggestion to you, is to start thinking about the angle and what you want in the shot.
FILL YOUR FRAME! Worry about the Post-Processing (Exposure, Color, White Balance, Curves, Luminance, etc.) at a later time. Once you've gotten your eye trained on seeing that "perfect shot," start investing time into editing the tonality and exposure.
IT ALL TAKES TIME!
You can have the clearest and most perfect exposed image but if the subject matter just isn't there (boring, lopsided, lots of dead space, too much going on), then your photo will not be an eye catcher. I can promise you that.
THE BEST THING YOU CAN DO in these particular photos, is level them (any photo really). The blue building is a prime example. Look at the quick adjustment I did. See how much better the image is right off the bat? It's all about symmetry my friend! I did this automatically in Lightroom/Camera Raw
Also, I removed the small lens flares and specks in the night sky and steps. It was a bit distracting. I then turned up the contrast (Curves adjustment), increased the clarity to give it more sharpness (usually used when sharpness is missing), decreased the blacks and turned up the vibrancy to get a deep rich look, as well as saturated only the orange level in this photo to really make that right side "pop."
Photos are a piece of artwork. The outcome is limitless and what you make of it. Some people don't believe in altering a photo very much, while others are manipulating like a mad scientist! Find something you really like, learn it, and make it your own!
I hope I was of some help
