I like it!
I suggest that you use a bit more water, the strokes seem very dry.
Cashio is absolutly right about the technical aspect, practice the single stroke. Remember that you paint/draw with a brush, so don't draw like with a pencil. Use the features of a brushstroke, which are for example the varity of the thickness of the stroke, the amount of ink, the structure of the stroke, to show the texture of stone, hills, grass etc...
You also might want to use different shadings of grey (50? ).

I look forward to the next bunch of maps from you!