Aww... this is so sweet. And six kids, wow! The one crawling into the cauldron had me laughing and I almost missed the three on the broom. I guess that's a good way for Severus to keep half of the kids occupied. I don't know if he'd be able to handle all six at once, haha.
I really love the fireplace and Dumbledore's portrait. It really warms the scene up. I also love that I can see a bit of both Snape and Harry in the toys, candy, and decor. :) Very well done!