Nice shots Charlie, although if you want a tip (stop reading now if you don't

) you may want to practice a little more on getting your horizons straight. No.3 is good, but the others are fractionally out (and it only needs a fraction to make the viewer feel drunk

)
It's something I regularly fail on, and is very noticeable in the final image. My camera has the option to put a 3x3 grid over the viewfinder, to help with getting horizons straight, and it can be fixed later in Irfanview as well, but it's worth trying to get the image right in the first shot.
I think I'm getting better with practice but it's still a constant trial

Pic 2 is really nice with the reflection under the bridge, you should try that shot again in the same light, but walk straight foward to the water's edge, and get the camera down low to catch the full reflection of the bridge. The same angle in dawn light may also be quite special.
Thanks for the walk Charlie