Originally posted by Duplo: Do you mind if I ask what you would have done different?
Hearing others comments on what could be done differently is my favourite way of learning.
I hesitate because these pictures are so much better than anything I can do. But, since you are 'begging', I'll offer you my take.
There is nothing really 'bad' about any of the images. Just little things that I would try to see if it makes a better image. They really are quite good, except for the intense blue of the cathedral image. That's gotta be muted down quite a bit.
Image #1 (city view across the river) I'd crop a little bit off the top. Maybe it is that ol' stinkin' rule-of-thirds thing.
Image #2 (lit cathedral) Even if the sky really looked like that at the time, it is awful and looks fake. Too overpowering and detracts from the cathedral. It's an interesting church, but I find myself not wanting to look at the image because the intense blue hurts my eyes.
Image #3 (lonely street scene) a pretty good image. If I did anything, it would be to play with perspective a bit. The foreground buildings slope up and away from the center of the image. I'd try to straighten them to see if it makes a more attractive image. You were obviously on the second or third floor shooting downward toward the street.
Image #4 (pedrestrians out for the evening) pretty good as is. I wouldn't do anything to that particular image.
Image #5 (riverfront buildings and bridge) rule-of-thirds again, too much sky; and I'd rotate counterclockwise to make the roofline of the buildings 'flat'. The bridge will then slope up to the right, but might make a more balanced image.
Image #6 (view across a bridge) I like, but might try cropping out the yellow building on the right hand edge.
Image #7 (river view) rotate counter-clockwise to make horizon 'flat' and the moon/sun is just a big blob. No shape or definition at all. Way overexposed at that point. I might try cropping from the top to just show a hint of the moon/sun, just the lower limb. Might work, then again, might not. As is, the 'blob' detracts from a very attractive image.
Image #8 (daytime waterfront buildings) one of my favorites, but the riverfront buildings appear to have too much post processing sharpening when compared to the somewhat hazy hillslope in the background. Hazy sky in background, crystal clear sky in near ground. Something doesn't match.
Now, after ripping your images, I'm fearful of posting any of my images here. Really, your pictures are way better than what I can do and you should feel good about them.