I think the odd thing for me is that the pic feels like the background is the foreground. By that I mean that the tower and the lightning in particular, which are meant to be in the background of the picture, are the bits that draw the eye while the stuff in the foreground just provides framing for it. Having the visual focus pulled that high makes the pic feel out of balance somehow. As some other have mentioned, if the tower felt further back, which would require it being lower on the horizon, then that might help with the overall balance because the focal point would be lower in the scene. It would also give you a lower angle that would allow room for a more massive crowd of orcs just be layering 2d planes with heads and spears. I do agree with Bryster on the technical LOTR aspects too: Wrong tower for Sauron, and you've got the orcs all wearing what looks like Saurons armor.