When you're about to take a photo, ask yourself WHY you are about to take the photo. Why does this photo need to be taken? What purpose does it hold? Once you've decided if the picture is necessary, spend time looking through the viewfinder to make sure it is actually constructed the way you want it to be. Don't just madly click the shutter then choose the one you like most later on the monitor.
When I look at your photo's, I hate to say it but they are extremely insignificant - I don't get why they are taken, and I fail to find any aesthetic qualities in them.
My advice is to think about why you are taking your pictures and then progress your images from there.
Keep shooting though, just put all your thought into the photo - not just the shutter.