The photo is very interesting but I think you can make it more interesting by recomposing it. Cut the left and bottom margins (especially the bottom) so that the castle to be placed in lower third of the photo and the tree in left one. And by the way, what is hiding behind that tree? Is the moon?
Alex said it perfectly, this is exactly what I was thinking except maybe that you dont have to cut out the tree yet, try darkening it in photoshop and maybe lightening the shadows. If you dont mind I can have a go at this? The little branch or what not at the lower bottom is very distraction from what could be a really neat shot!
