Interesting building. Unfortunately, the picture is at such a low overall contrast that I didn't see the eye and ear at first. I don't think there's much to be done with this picture except to go back and reshoot when the sun is nearer the horizon. This looks like noon/afternoon sunlight which doesn't cast enough light on the vertical walls (since the light is vertical) and provides too bright a sky to really make the subject stand out from the background. Early or late sun would throw more light on the walls and darken the sky, focusing attention on the castle and bringing out the textures of the walls and the odd features of the tower.
Also, better light would let you know whether the wall is interesting enough to keep in the photo. Otherwise crop it out and have the tower in the opposite corner of the picture with a twilight or night sky in the background.