This is a really good shot. I wish you could have de-emphasized the sky though. In this case it doesn't add to the image, IMHO. However, it's still a good shot.
I love the B&W of this shot for it calls attention to the subjects in this composition. The sky is simple and flat which is very good because it does not add any texture that would distract from the main focus. Love how you have captured the men working on this crane. The B&W gives the photo a feeling of nostaliga - like of days gone by. Surprised that you did not have a title for this one. I have looked at this twice and it really captures the spirit of early industry. BTW, the second time I gazed upon this image I got a flash of imagery of this image being akin to that famous photo of the Flag Raising At Iwo Jima....only this men are raising the crane.
7 - Good shot, good almost silhouette effect. Criticism; difficult to tell, but seems it needs a slight nudge rotation up on the left, but the horizon in the distance seems level from what I can discern so not sure. This definitely needs 640 height to help it. The b/w(?) toning works well here, nice overall 'feel'.
Nice silhouette, I really like the composition and use of negative space. Unusually, the completely white sky really adds to this image; normally it's a turn off.
This is beautiful. The silhouettes of the machinery are great. I don't mind that the sky is all white, because it focuses my attention on the machines.