I did not know baby blue-eyed slytherin gunnar was a hatstall (I think) (I'm pretty sure) but this makes a lot of sense. this is super neat and I love how you've used the pen strokes here, in all the different fabrics and the hat (which is also fabric I know, shhh). you've captured him and his baby 'get on with it, jeeez' expression wonderfully
also that sorting hat is