Welcome Alex. C&C per req:
1. I really like this image. It's a nice,high-contrast mono coversion. The composition is interesting, but I think there's another image which would be worth capturing too. Shooting from a similar position with your camera positioned in portrait aspect and zoomed in/cropped so that you only have this bridge in the image. I would also consider a day with a better sky, but overall, nicely done!
2. I'm afraid I get almost nothing from this image. There zone of focus is very small, and thre's a lot of distracting elements; my eye really doesn't know where to go.
3. This is another interesting image; I'd like to see the exposure on the trucks reduced a little bit, but I like the effect. How did you light this one?
4. This one needs some work IMO. The background, while softly focused is still very distracting, and the image is at least 1/3 - 1/2 stop under-exposed. As well, try and have the subject look toward you, not necessarily down the lens, but at least in your direction. The colour also seems slightly off, perhaps a WB adjustment? I'm seeing a slight green cast.
5. A classic, and nicely executed except for the missing top of the sun. I would also consider cropping a bit off of one side and making slightly less centered.
Overall, some nice, and interesting images. Looking forward to seeing more.
Just my $00.02 worth - your mileage may vary.
~John