From a purely realistic standpoint, I agree with ICM about the shadows on the sky dome. I also think the clouds on the horizon are a little small and awkward. They seem too regular. The ground texture is really nice, but I think it would do well with a bump map. The shadows give away it's flat nature. Also, when I look at the image, I can see that the braziers (I guess they're braziers) are the brighest light source because of their color, but the object in the center, the pedestal, is casting all the shadows. I should think that either the pedestal should be brighter or the braziers should be dimmer. The colors are very nice and earthy and the green sky is quite warming. Compositionally, pyramid shape is classic both and strong.