Ajhasgdjhsgjdhksagjhdfgdjhksa!!! I really love this sort of Fanarts of Potterlock! And you made them just so adorable! lol Loved it! Got the Uniforms right as well... many people put Sherlock in Slyth, though. Or John in Hufflepuff. But I like them just like this! Awesome job!
I love this combo, too! I totally understand why people think Sherlock would be in Slytherin, but I personally think he's a total Ravenclaw. (Mycroft would definitely be in Slytherin, though.) And man, John is nothing if not a Gryffindor. I can imagine him being the gryffindor beater for the quidditch team. Wow sorry, I started ranting.
Personally, I favour Slytherin!Sherlock and Hufflepuff!John (for reasons you've seen many a time if you've ever looked in the comments of a Potterlock fic/pic XD), but this pairing is quite rare for some reason- at least, in the parts of DA I visit.
John as a Gryffindor beater is just too perfect, I will agree on that. XD