It looks pretty snazzy but I've got some concerns about gameplay. It looks a lot like siege. Too much like Siege. If we've got a Siege map then why do we need this map? Keep that question in mind as you develop this.
I know you've still got some plans up your sleeve and you've been getting some excellent advice.
Here's what I'd think would be cool. Start adding people to this map, it would give it a dynamic rarely encountered on CC. Perhaps archers, a sieging army, a king and queen. Perhaps the artillery men in the tower? Hold an artillery man and cannon for +1?
Speaking of people, you could make for some unique bonus systems. Hold a cannon, artillery man for +1 hold the artillery man, cannon AND the king and make it +3.
Or something like King doubles all bonuses.
Hold sieging king and defending king for the win.
Hold a spy and the entrance for the secret passage for +3?
The graphics are pretty good, but there's some weird oddities going on. For example, when water touches land, it doesn't look like a blue bubble. Add some surf and white foamy looking stuff, like waves on the beach.
The inner castle doesn't seem to match the rest of the map. I love how you did the floor of the tower, perhaps something like that would work?
The bridges seem very... animated. Whereas the rest of the map looks photo-realistic. And the passage looks like you just put color over the trees. Hell... perhaps you could do a secret trail instead of passage?