dark arts student, Hogwarts uniform, black robes, silver trim, house crest, Slytherin, green tie, wand in hand, casting spell, intense gaze, slicked-back hair, pale skin, smirking expression, standing in dungeon, stone walls, flickering torches, magical atmosphere, ambient green light, 3/4 view, dynamic pose, leather boots, aged parchment, potion bottles, ancient books, cobweb textures, eerie shadows, high contrast lighting, cinematic composition.