I'm sorry Donna, but this looks a little to 'cut & paste' to me. There is nothing that blends the tower into it's surroundings, i.e. shadow, reflection, etc.
Perhaps it is only my monitor, but I'm missing the top of the tower, other than that, I like the mood, as it fits in with the series you're producing. :)
I like the texture/pattern of the tower a lot. This has a foreboding but calm mood, somehow. As though the world is one of resignation to doom, perhaps.
I'm also missing the top of the tower though I like what I see. I think maybe the base of the tower - the way it is seated in the landscape - could be improved, though I've no idea how you'd do that, of course.