I like the scene you've made here. I wish that your merchant wagon had been able to work it's way into the picture, so that it would be available to load supplies into, but it's ok that it isn't
I also like the pilings and the way you did the water. The white parts are in all the right places.
Lastly, the evil knights look a bit out of place. Everything else is filled with action, but they are rather static and they seem too heavily armored for the scene.
Great job, and keep up the good work!