Incian Sphere map

I do love creating maps on paper, for stories or for fun - and I can be happy because creating maps is the only thing I can do good. But this? This is something I could never create. I have no idea how you make maps so detailed, but clear. Everytime I take paper with new map in my head, I have two options: lot of detailes and no letters OR almost empty paper, but with names and else.

I like this map. It's got atmosphere and... and it's nice. Well...