Ever thought of having the a wall near that fountain at the back. A wall that is sort of shorter then the rest. Where it has a walkway on the top going across to the side walls. I was thinking of one of those cities you know where it has a sort of commoner section then a section for the more wealthy.

Also ever thought of a smaller tower coming up from the center of the large round corner sections? So you have a walkway going around the tower with a small spiral staircase going up. I was thinking of a small room at the top with a ladder going up into an archery tower thing on the tops of the towers.

Also since they have sheers you could make a hanging garden around the inside of the walls. You make a small ledge up along the top pf the wall with a trench filled with dirt. Then you put wood that goes over the sides and down. Then you randomly cover them in different spots so it looks like it randomly grew that way.

I am doing that very thing for a project I am making it makes a really nice effect.

i agree with avmf8 u need a massive drawbridge on that gatehouse. also a large keep comeing off the righthand wall in to that large area with the water wall next to it would look good with the water gone

The gatehouse seems to go to nowhere but water. So maybe a bridge going across that lake or simply put more land in front of it. Also how about a castle connecting to that back wall there. By that I mean the back wall would be part of the castle. The result would be the whole town looks like a massive castle.