Thanks for the map
The changes you have made to the terrain tiles are very good, things seem a lot easier to define especially when zoomed out.
Regarding the random fill tool its good for adding a bit of "colour" to the map but also very effective for modifying generated maps.
Good for placing groups of trees or gaps in dense forests.
Very handy for generating an objective like a little town.
I do a pass of dirt or some such then buildings, sometimes not quite what I want but just hit undo & do again.
Takes minutes to produce something acceptable.