Well now that is pretty damn awesome. Love the sharpness of your edges on the mountains and things, oh and the color. This may just be me, but I'd really like if you kept that local reflection from the last wip on the wall. That bouncing sharp green just looked awesome to me, and I still see it there, but it's kinda decreased.
If there's one thing that bothers me about it, it's the odd sense of scale.
The little city down on the gassy area is so small compared to the massive buildings up above that it just throws me off. Even the stone walls of the city up on the upper-left are bigger than the city down below itself.
Though maybe it's a city for giants being compared to a human city?
I don't know, it's just a personal thing I picked up.
It just seems for me like the perspective is going like this <
And the scale is going like this V, but you did great job on making the huge things seem really huge, and the small things pretty damn small. Love the idea.