Digging those clouds! I agree with CELS, the tower looks a little bit off and I personally think the left window makes that side of the house look a bit jam-packed. But other than that, a lovely piece!
I like these clouds a lot, but I feel they'd look a bit better if you went through and smoothed the sharp outward angles and two-wide cuts (like you can see dl.dropboxusercontent.com/u/86876178/houses_tiny_clouds.png here). I like what you were going for, but I think the texture on the clouds seems too coarse/sharp in a way that doesn't match the rest of the image.
I love love love the colors and the overall style!
Very nice! But the church tower is not aligned with the center of the church. Was that done on purpose? It looks slightly off-line, which makes it look accidental. If you didn't want it to be aligned with the center, then I would move it further from the center line.
The clouds are very nice for silhouettes. The rock is okay but I think the clouds make a really nice matchup with the buildings.
that tree, remembers me the FEZ's trees. 
. I like this drawing style, good work. ^^
Gorgeous!