it kinda looks like Rapunzel's fake witchy mom Mother Gothel (Since I'm not a potter fan, don't have much idea who Bellatrix is). I think that's what the person below me just said too, actually. Whoever it is, awesome job! I like the juxtaposition of the bright, cauldron green with the deep bluish violet up at the top. The smoke effects are unique as well - I haven't seen them done quite that way before.