Thanks for your advice! I think you hit the nail right on the head. I kind of lost myself in the exterior look so much that the scale felt less relevant. So it is a bit too big for minifig scale. I did make a Carl that could fit the scale. I could try to add him sitting on the porch. If it doesn't work out, I might have to start the daunting task of resizing it to minifig scale. BTW, I already tried to add the balloons, but because of part count issues, I'm afraid that's not going to work out :-).
Oh, and I'm also a supporter of your Home Alone house! Looks awesome!