This looks awesome. Very fitting for a cover. I must say that the top part of the image, where the buildings are that much further away should be more affected by atmospherics. Less value variation, since the stuff is far away. It might come off a little flat otherwise. Once again, you're awesome.
I like the color scheme and the elegant design of the buildings. - in fact the entire thing is amazing save for that random guy over there. He looks out of place and takes away from the possible scale of the buildings (as in, they appear huge untill you notice the guy). Makes me wonder if it was some kind of requirement that was added or a planned thought, because it kind of looks like the former. Other than that, a really amazing work.
this is beautiful! i so love mystical and epic scenery . . . i always aim to create things like this myself... but traditionally doing something like this is damn near impossible..until i get a lot better at oil painting maybe XD wonderful attention to detail.