I'm not sure I like the clouds in the background, the style is dramatically different to the foreground graphics.
Foreground graphics are good but the bricks are too "busy", I think you should replace the black outlines with a "lighter" colour. Otherwise not bad so far.
Very pretty, if a little busy looking. I like the way you've blurred the clouds in the background - i think it'd look even better if the clouds were a more "conventional" shape and the mountains were as blurred too.