Ahoy pikkio, nice to see you here.
I'm liking the general feel you have going for the map. It's developing into something of its own, and as MrBenn noted, seemingly coming to life.
And speaking of life, the addition of some...maybe tiny animals, maybe tiny peasants/soldiers, might add that vibrant life touch to the map, if that is a route you are interested in pursuing.
Title and gameboard bordering feel appropriate, but some of the textures on the gameboard itself feel a little too intense...more so the Fields and Mountains than the other quadrant regions.
A stylistic thing to consider, eliminating the perfect circular moat, making it more of island rather than a cookie cutout. But this isn't much of an issue.
The catapult icons and desert grasses are alright, I'm not completely sold on them, but I'm sure you'll be tweaking for a while, so not much worry there.
Maybe consider adding some "Height" to the towers, perhaps through more contrast between lighter and darker tones.
I haven't looked into the game play, so I'll save those comments for later.