Wow! This is beautiful. I can't imagine how much time it must have taken you to realise. I especially love all the details: Hogwart's lighted windows and the sky behind, the 'flames' around Harry when he transforms, the limit between Harry's body and the snake's body during the transformation and the glasses on the side, the snake itself, the Great Hall, the vials of potions, Snape's face, the atmosphere of the forest, the cloud covered moon and the stream and the plant, Snape's hand, the ray of light from the window and the goblet, the fire, the snake's position. And the colouring and the lighting. OMG, so wonderful! Loved it, it's fantastic, really!