Thank you very much for the nice comment and the photoshop idea, Nacho. Unfortunately I like the original shot much more, since it combines very dark and very bright colores on a singke shot. This is why I shot them this way. Your manipulation washed out the strong contours in light and shadow regions and added graininess but only in the darker regions.
But if that graininess were uniformly distributed over the whole phot, then it could be really something special!