Not bad but try to spend a bit more time to clean up around the house (trees & air). Good luck!

Nice style!

Using a Noise/Blur/filter on the boy would help in blending (to match the source image) be aware of his size as well, he's looking quite cut and paste at the moment, which can cost you vote score..(his lack of shin and feet is a bit weird) the concept is interesting, just needs a little tender care to blend better.. (you may want to delete the BRIGHT edges around him or at least burn the edges so he looks INSIDE the house.. the same with the boy image on the second floor, as his outer brightness could blend better.. good luck though and as always IMHO

follow up Drivenslush.what he tells is really helpfull for you.