There is something so simple about this one, that causes me to like it a lot. It is a step away from the forboding factories plumming smoke, but is still very much industrial. Love the symmetry.
7 - Very good, good coloring too. Criticism; seems like it needs a nudge rotation up on the left - this looks like it is crooked, but apologies if wrong. Coloring is good, and while has a slight 'grungy' feel, like to see a little more contrast, and/or bolder colors, if possible. Maybe a different cropping too, not sure.
Oh I love this. The visual with the perfect symmetry including the diagonal sense is very interesting to the eye. I like the bronze coloration of the stacks with the pale aqua of the sky. That hint of golden orange of the railings (scaffolding?) realy helps too. This is great. 9