Think these are good starting shots!
I'm not the best person to comment on urban shots, as i havn't really doen much urban shooting, but i'll try and help lol.
I think tecnically the shot is ok, think this is ok
With a tripod think this woudl be good, another think is that when you shoot pictures try lots of different angles of the same picture, i find this way you can delete the worst and keep the best.
For example the yellow box in the top right slightly distracts the eye
Again without the signpost in the image, i think this would be a really good shot! Instead of just looking and taking a picture, think for a second about the composition
I like this shot! Only thing i could suggest would be a slower shutter speed, to make the water smooth etc... But thats only beacuse i like water under slow shutter speeds
Think if you stood directly infront of the foundatin, to make all the edges square, and remove the person from the images, this woudl again be a good one, possiable again slow shutter speeds
The sky is too bland, if there was lots of colour then this type of shot would be ustified, but due to lack of colour/interest i'm not a fan
Again with a tripod and slow shutter speed i think you could have a really good shot hear
I hope this helps, as i said i'm prob not the best person to comment, but i hope this helps you. It's a very good start, so all i can say is keep shooting, you can only get better!!