I completely agree with everything NeonKnight said, especially regarding water and gates. I think both of those elements would help finish it up, and adding water and gates can only make an adventure or combat a bit more interesting. Plus, adding some blue from water would give it another color, and that might help make it look more finished.

Also, I would also make the pikes cover more of the palisades. Try not to make them all straight, as you've done. Make a couple crooked ones. There's a lot to be said for funneling attackers, but there are so many areas without pikes that they really don't see too useful. That, and there aren't gates. Maybe even just a wagon they can move into place is all you need.

Well, that's up to you. Good luck and have fun!