This is a great matte painting! But the composition is lacking as there isnt a whole lot going on on the left side. The left side feels empty and you could solve this by placing the boat over to the left. This would also put more focus on the boat. Currently the boat is "hiding/mooshed" inside the shape of the castle. This creates unwanted visual problems. The pole of the boat looks like its a pole or antenna attached to the the roof of the house at first glance. Simply moving the boat would solve this.