Thanks Barek, glad you like it.
The forest has no own texture. It's just a kind of "parchment" overlay layer on top of the plain color layers. Since it's really impossible to find a "realistic" parchment texture this big, i had to use the plasma filter (desaturated) in gimp for it. It's the one that comes closest to the look i was searching for. Still not sure how to make (draw) an actual forest texture for this map.

Btw. If you mean the working time, yes it takes literally years (the project is a bit too ambitious for me i guess)! But i can assure you, it won't need years to do something similar. Just give it a try! At least that's what i did, and to my surprise it worked out...