Remember that what you're seeing in people's portfolios reflects the balance of geography/topography requested by their previous clients, not their limitations. Any of these fine artists can adapt to your requested detail level if you happen to like their style. I am quite sure that Hyn could draw a map suited to your geographical/topographical balance of choice, especially if you can come up with an example or two that represents what you need, as they do unique hand drawn art to spec.

As should be no surprise, I have many maps in my portfolio as well, although my work is decidedly different from all three who've posted so far and definitely less "treasure map" than Strigun and Hyn. Feel free to check it out at your leisure and if any of my maps capture your attention, reach out. My work is much more commonly found in novels though. Cheers!