This looks pretty good to me. I seldom bother to correct for "blueness" in my images, unless of course it is necessary, like for people or documentary purposes. This image has lots of mood and I really like the secondary motif, that line of grey clouds in background. You don't want to lose that in alterations. One thing I find somewhat disturbing, is not the large crane on right, which would have been better as a whole, but the black post underneath; this creates a kind of stop-frame, which I don't think you want. You also have some slight parts on the left- very minor. As to cropping, one can do that all day, just decide which elements you want to keep and what appeals to you most.
I just reviewed it again, and the black post might be OK if the whole crane (not tall part, just the width) is there, as it will no longer be at the edge of the frame.