I'm not an artist so don't expect any good constructiv critic.
But I have to say:
WOW! very nice.
I like the style.

Now some critic:
I don't "feel" the fire. What I mean is that I dont recognize it as "hot".
But I have no freaking clue how to achieve that.
Maybe a higher contrast between fire and the rest of the image?

Other than that: very good work!