Interesting combination of methods. You have some calligraphy / hand-drawn stuff going, then the topography is all shaded-relief photorealistic, all on parchment. Hmmm. I think I'm going to imagine your mapper has somehow embossed the parchment from below, leaving "real" 3-d surface details.

It is a pleasant look. Is it all dry and barren? That's what the colors seem to say.