The sky is lovely, but the land feels a little "flat" in terms of visual drama. As a composition it feels rather busy. The subject is obviously the castle, but there's just a lot of "other stuff' in the frame, competing. Is this a sky with a castle in the foreground? A seascape with a sky, and a castle tossed in for good measure? Or is it a picture of a castle, with some frame context, and some sky for drama?
I feel like the photo can't make up its mind what it wants to be when it grows up.
I very much like the alternate viewpoint, however. Castles looming above us, castles on the horizon line, castles every damn which way, I am sick to death of them. Castles from *above* though, that's a little different, a little newer.
One idea might be to imagine the castle from the point of view of the enemy. This is sort of leaning in that direction -- the scout on the hill, looking through the trees, mentally counting soldiers and weighing fortifications. There could be a nice historical touch here. Castles weren't decorative tourist attractions, originally! Just an idea, maybe it'll spark an idea you like.