Hm, just looked back to your picture and I remember the moment adding my comments in which I mentioned the colors in the snow washed out. Reading the reactions here I got the impression most things are said yet. I asked myself, does the original look similar to the RGB-version we see here on screen? The limitation to only 24 bits means, in fact, 8 bits per channel, that is 256 tones. The needed range for this picture is beyond that, but it can be your original showed them far better and colors might have gotten lost in the digitalisation process. My slides show usually far more details compared with the digital version. Dark regions get black (and noisy), and the same might happen to negative film in the bright area's. So perhaps your original is sufficient while the scanner is not. But you're the only one who can check that.