The subtlety of the flaming hooves and tail is perfect. Leaves it very believable. I have tried to get a similar look in the past and failed miserable, so congrats. The overall composition is awesome to, I just wanted to single out that very successful portion.
FYI I believe that they have been looking for someone to really nail Beric Dondarion's sword for some time, and you might find that producing a Beric vs the Hound piece mail nail you some $ with the use of this flame approach.