Maps would be as open ended stylistically as any other kind of picture making. What I would take into consideration is the feel you have for your books. Maps can be dry and stark, or you can do a line with an ink wash in which the wash can help separate the regions (like water vs land), or you can take it all the way to where you kinda sorta render some of the featured spots, like with Game of Thrones intro.
I have even seen maps in which the illustrator mixed a 3/4 down shot that graphically showed roads and such, but the featured buildings were more illustrated and traffic and pedestrians were stylized and expanded (like a map ballparking a big city in a shorthand way). Then there's the theme park map where things are somewhat rendered more like an actual aerial view realistically or cartoony).
All depends on what you're wanting to do and how interesting you want it to be and what the function is for it. If it's strictly informational, make it clear and simple. If you want it to also tell something of the story or inspire a feel, consider what would make that happen. But you are allowed to get creative with maps, believe it or not, unless of course it's a proper road map kind of thing. But a map does kind of set a mood, of an era, a genre and a sense of place.
Could be really fun. If you don't have much experience as an artist or mapmaker, I would start by blocking in the stuff you want to show. And your tool selection for the finish would follow as you try things out on layers that can be seen or hidden for comparison.
Have fun. There may be people who actually have done maps and can answer your question more specifically.














Last edited by D Akey; 08-05-2016 at 09:48 PM.
"Not a bit is wasted and the best is yet to come. . ." -- remembered from a dream