The fire is done correctly, and more contrast would do it justice. Also, this would have been a great opportunity to try on source lighting. The fire should be reflected off the armor, that would have given you an even better score.
I like the fire because you did it properly (lighter at the hotter spots). What I would do to give it more impact is whiten it a bit at the source, and darken up to red/almost black at the tips of the flames.
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