I'll go with Chase on a few points. I like that's there is lots of sky, it sort of shows where the steam is going, but there is too much. You could cut off a chunk of the dark part at the top because there is nothing going on there. I like the placement of the towers, that lone sleeping chimney is sweet. :mrgreen: I would also like to see more of the foreground. It seems like you've cut it off a bit abruptly. It disrupts the natural flow that you had going with the lines.
I prefer the colour version. I think the towers look best with their slightly dirty shade of brown and the greens add a little extra interest. In the black and white version the greens have merged to give you a flat dark grey.