First of all; none of your pictures are 'failures'. Not at all. Don't think that.
As mentioned, lots of your shots are very 'busy'; there's a lot going on, but not much of it very interesting, as a whole. There's a tram, there's a person walking, there's a building, there's a tree, etc etc. All in the same image. Try to look at a scene, and find just ONE thing about it that interests you. Is it the building? The person walking? The tram? The tree? Those shots are perfectly fine as general visual information, but not very interesting as photographic
art, if that's what you're trying for.
Try using the principle of
Occam's Razor. When you look at a scene, cut out the stuff you don't need. What story are you trying to tell? Very often, less really is more, with photography. Think about how many good portraits are just of the subject, with no other information in the frame. A landscape can include everything in the scene, and work really well, but only if all the elements work well together.
One image I found more interesting, was this one:
https://photos.google.com/share/AF1...?key=bXZhcDRQVElKYkI1ZU5qS2R5NUJkMG13dXZvRkp3
I like the rows of houses, the diagonal lines of the roofs, and the nasty looking fencing in front of them. Gives it a harsh, inhospitable feeling. Now think about telling that same story, but in a simpler way. For example; what if you framed the shot so that you only focussed on the tips of the railings, with their sharp spikes, and rendered the background, the line of roofs, out of focus (by selecting a large aperture). Done in B+W, I think that would be a lot more powerful, in terms of telling a 'story'. But that's my individual take on it. Everyone's got a unique view and perspective.
With some of the other images; maybe concentrate on sections of the scene more; like just the arched roof girders in the train station, they have their own patterns. Or just zoom right in on some of the windows of the old factory buildings. Pick out the details. Again; less is more. Try to break scenes down to their fundamental elements; the shapes, colours and patterns.
As a beginner, it will take time to develop your 'eye'; your own unique way of seeing. But take time to look at as many other photographers' work as you can; you have the whole of the internet!
Good luck. And remember; CrossRail wasn't built in a day. Actually, it's still not bloody finished, and massively over budget...