From the thumbnail I already thought that the composition is 'too balanced'. Tower left, big (nice) tree right. I would probably move my cam to the right, have the tree a bit more to the front just off center and the tower kind of behind it. And add some more (of these) trees (1-2) near the tower's base for size reference. I also think the loose grasses are too 'loose'. They would stand in groups or be with some other grass, I'd say, or some pebbles or stuff.
But I do like the scene (and sky) very much. Is that tree some existing species?