WOW!!! This is exquisite!!! You have captured the moment perfectly. I love this scene in the film because it is so faithful to the book, I think only in this moment and also the graveyard sequence in "Goblet of Fire" do they get it so perfect. You are very, very talented and obviously very passionate about Harry Potter.
I do like that flame effect. I wouldn't worry about the crystals. Tell people you're building from the book. As your collection grows you'll be able to build bigger and more complex mocs. see ya. garth
Awesome! The only possible improvements would be to add any clear pieces if you have any as crystals, and to make the inferi less skeleton- like, and more zombie-like if possible. The flames look awesome! I'm surprised you haven't been noticed- you are a good Harry Potter builder!