High Mountain hillshade is not "natural"

after generalizing my DHM and extraction of different color-hillshades, I got something like this:

Its not very good, but I used the idea of Imhof generalizing and coloring the hillshade (multishade). Its "digital-round-smooth" like "organic" and not "natural-edged-hard" like I want it to. (Sorry for that kind of english :)

I mean, in natural its a very steep and hard mountain range, and not a hilly "hobbit-land" :)

Do you have any Idea, how to construct it more natural?

Thanks! Martin