Very nice again. Quality isn't best possible. Have you tried resizing the image, decreasing the size to 70% or something like that? Anyway, as Elune-555 told, the sky is pretty neat, just like the buildings. Those tiles had to take ages.
I used acrylics for this picture. All the pictures in my gallery have been done with acrylics. The sky went through a lot of changes before I was happy with it. At one stage it was pink. Then it was dark red. I like painting skies.