OK - I need suggestions!

I have tried a whole bunch of mountain styles, but nothing that I am happy with, that portrays the sense of scale, and fits with the clean land/river style.

This continent is about the size of Australia. Here is a rough comparison based on the information I have:

Click image for larger version. 

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Any suggestion on how to represent the mountain ranges - again, using B&W only, would be helpful.

Thanks,
-Rob A>