Great job! The drawing is brilliant. Younger Dumbledore and Filch, all right, but with hints of them as we know them. Your Filch especially is just so. And Albus's sartorial insights are a delight.
And the story is so very believable. The way Filch's parents dealt with the boy. His life in the mines, and then in the trenches. His directness. ‘Christ, man! You’re a tactless bugger sometimes.’ Vintage Filch.