good compostion
:-? Where ??
Seriously, these are not bad (in fact I think #2 is pretty sweet with the fog you can just see through), but composition wise I think you could be a lot more creative. These shots feature almost all the same angles ... hint hint

Try to have something else in the shot that is worth looking at (nice clouds or scenery (not just concrete). and read this post. It will dramatically improve your performance and graphics quality

Good luck mate!