I was approached by a writer who saw my work and was asked to make a map of his high-fantasy book setting.
To prepare for making the map I was given a brief overview of the different regions in the continent and the lords and kings of the area etc.
I was also given an extremely rough sketch of the region, I try and modify the map a small amount to have borders aligned to certain biomes and features like rivers and mountains to draw boundaries. To start making the map to lend it some reality I created the map using sections of real-world satellite imagery.
After all that I created basic vector versions of the map bringing it into Photoshop using different effects brushes etc to create a more real map with its own biomes and mountains giving the feeling of a real map once all that is done adding in the boundaries of regions and their names.