Attached Link: http://www.currys.com/knowledge/landscape.asp

Your subjects all land in the center of the image. The leading perspective of the foreground terrains, the castle, and the ship. It confuses the viewer. Try turning your camera left or right which will place the castle on one side or the other, and place the ship coming or going in reference to the castle.( a bit smaller ship too) The components look great. Check this out, probably one of the best visual composition tuts out there.

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Ockham's razor- It's that simple