I second Xobim fully, though my personal favorite is the fourth. The contrast is amazing, especially how the people are visible as silhouettes against the reflective road. It implies their presence without making them obvious or central to the image.

I personally don't like the color ones as much; they might be good alone, but right next to your grayscale photos they look much less crisp, like maybe you used a different camera (except the statue, which looks very sharp). I think the main difference between the first photos and the latter ones is the lack of contrast; they are too busy and colorful, especially the cityscape ones, and the angles they are taken from are too generic. I think the shot of the bridge could've been great in terms of contrast (with the light colored building against a dark sky), but all the bursts of light are too distracting.

Of course, I'm hardly a photography critic. I wouldn't feel right saying "try less bursts of light next time" when it's really out of your control who has their lights on and who doesn't. There's an element of luck there I can only be in awe at; that you were able to capture these moments naturally rather than create them must take an unimaginable timing, and I'd feel bad saying "time better". But regardless, the best advice I can give is to keep contrast in mind.

Have you considered posting your work on stock photography sites? I know on some you can get paid by people using your images, while others are free, usually just with a term of use like "let me know anywhere you use it". There is definitely a demand, as few designers take their own photography for their products.