Thank you @ProMapper. Something about my work process I wrote in the topic "New panorama of Germany", but Im happy to describe it more accurately.
As a starting point I (usually) take the classic cartographic map of area, which is then processed in a bit - program (photoshop). Map is than drawn in several layers. I separated forests, valleys, cities, hills, so that each of the layers could later be color corrected. The Alps are produced with the help of an atlas, so that I can accurately define each peak. In this procedure, Im using a brush that has a size of 8-12 pixels, depending on how accurat area I want to achieve. For example, in Germany I used a brush whit size of 6-8 pixels, which means that panorama is very accurate, but it has disadvantages as well. Work process is very time consuming and from afar away map does not work uniform. However, in Germany, I can now use the individual captures as a single map.
The second part of the map are descriptions and contents (roads, all the names, rivers, all boundaries, small lakes, airports, symbols, ...) That is provided by my colleague who uses Corel Draw (which is more friendly to use than Adobe Ilostrator). Usually, for this part of the map needs as much time as is I to make panorama.
For makeing Croatia, until today I spent around half a year. But really intense work (about 12 hours per day). I use a brush size of 11 pixels. Map will be completed in late August.
I attached a first version combined with content. And I "play" a bit with colors
All the Best, Bojan