So here is my burn tutorial. It's not as complete as the other ones..sometimes when I get into a makeup I forget to take step by step pictures, but this pretty sums it up!
Hope it helps, let me know if u use it, i'd like to see your results!
By the way, I used the wonderful fire brushes from ~Resource42
which you can find here
Haha, I totally forgot to say that after applying the cream makeup, I added a little bit of fake blood in the...parts where it looked more...burnt!