Thank you very much for the nice comment and the ideas, Ahmed! Well, I also think that the clouds add to the strangeness, now that you told me. I do like grain very very much especially on B&W images, since it adds something "of age" or perhaps "unreal" to the image, and so I use it very often (pushing). I didn't push this one though, but rather used a bit of underexposure in the hope that grain could be visible especially in the darker parts.
Now I wonder what would have this looked like, if had used a lower film sensitivity and a longer exposure to avoid the grain.
Is it because of the way only part of the clouds seem to have light? The way the lighted area of the sky cuts in diagonal form is nice. I notice the noise, and I think the silhouttes would have been nise without. Regards, Ahmed