Making hard internal creases/corners

[system]

Hi,
For my university project i am trying to create a stylized cliff/mountain mesh that I can use in my game engine.

This picture is the style I’m trying to recreate, however I am struggling to replicate the hard internal corners between the different rocks. I’ve been using several different brushes including the TrimSmoothBorder and hPolish, but I cant seem to get enough information to keep the edges seperated at a hard corner.

This is what I have so far…

Any solutions or links to tutorials would be greatly appreciated, thanks!

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[Altea]

The model that you use seem composed by several vertical pieces, I guess 7. The natural boundaries between the pieces makes easy the hard corners and probably makes easy modular variations. The rhythm of these divisions and the fact that the top has smaller pieces makes the rock more credible, as if erosion has affected them in equal ways.
Your piece seems only one piece. Probably simply copying the divisions of the original model would help.