This piece shows just soooo much talent! The anatomy, the colouring, the perspective - it's all spot on and so realistic.
I love the fact that you've had the courage not to prettify them at all - Snape's grimace and Filch's saggy, poochy belly are fantastic, and the pictures he has lovingly displayed on the wall (and the manacles, just below his mother's portrait!) add so much atmosphere and comedy to the whole thing. Really stunning :-)