Hi, great work you did there, but i advise you to watch out with the broken lines on the roofs and in the light on the windows. Kaiseto made a tutorial a few years ago explaining how to fix broken lines and that sort of stuff. Oh. Wait a min. imgur.com/WeyZIra . I changed a few things to show what i am trying to say.
I made the saturation a little bit lower. And see the dark pixels in the cracks? Maybe if you remove those dark pixels the cracks will look cleaner and without the fat pixels attached to it. And using the darkest color of the cloud you could put them in the edges of the clouds to make it smoother, since the grey does mix well with the blue of the background and the color of the clouds. I think that's all. Great pixel and i loved your sketches on your tumblr!
thanks for the feed back, I look into that right away