I love the clouds in #2 and #3, truly beautiful and adds a great mood and tension to the shots, really achieves what you were setting out to do.
The dark outlines of the mill (or whatever it is!) in the second image are great, draws the building away from the background and focusses the attention well.
I'm not so keen on the first photo, it doesn't have the same moodiness as the other two, still a very nice photograph though.