This sky is very unfinished, and I have only really done the rear layer. I will update when I have the other layers of buildings, and their fire/somke eeffects done, and the Depth of Field effect is done, and it tiles flawlessly.
It looks better than I ever imagined it would look and I can see this as becoming my best texture yet. it took me over 10 hours to make that from a picture of a city with a clear blue sky
(which meant fixing the blue color caste in the image was the first step I had to do).
Here is a sneak peek of the Burning City Sky texture for Doom II, that I am working on.
UPDATE: I added a reflection of the Burning city, and softened it on the water to improve the realism I also added a reflection of the pontoon, and modified the smoke, added some charring on the buildings
(still in WIP phase) and added some glow between the buildings and the forward layer of fire. Special Thanks to
@Dune Drifter, for the suggestion.