This is a very nice map. And great work with the bevel effect.

If you wanted to add a bit more variation to your beveled cliffs, you could try this:
Create another sheet just on top of the one with the bevel effect. Then create an entity with the same texture as you have now on the top of the cliffs and follow the top of the cliff.
Once this is done, increase the bevel size. This won't be noticeable because the top of the cliff is now covered by the new layer. Now you can start adding variations to the new sheet. If you want, for example a smooth upper end of a cliff, use a mask to fade out the contour of the new layer. Or if you wanted to emphasize the steepness of the cliff add a slight dark glow (this could probably be achieved by creating another layer just below the new one and use a smooth dark brush). Also, you can vary the height of the cliffs by moving the edge of the new layer.