Hi Txules, Very powerful shot, with a great use of lighting. I think the lighting creates some really surprising effects here, as it seem to mix shadows and silhouettes beautifully.
As to the composition, I think the shilouet on the right is a bit too dominant, but other than that, I think it stresses the crowded platform very well by not following the standard approach.
Another minor thing is that I would dodge the button of the man's shirt, it's reflection is just a bit too prominent compared to the overall tonal range.
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