It's pretty cool. Perfectly servicable. However, there are a few things I might suggest that would make it more pleasing to my eye, at least. (Please don't be discouraged.)
- The black patches on her skin are dark areas by comparison to the flame. The brightest bits of flame should be furthest from these (the orange regions should be darkest nearer these 'shadows'). Otherwise, one could be forgiven for mistaking her skin for just plain orange skin with black scales on it instead of a fiery substance.
- Her clothing should have deeper shadows on it (and those shadows should be cast by her own fire, or at least recognise that the fire is a light source besides the sun). It looks a little flat to me, especially with all the strong shadows the original artist has laid down. Emphasise her contours a little more.
- I personally would have coloured the outlines of the flames a fiery colour (not her muscles, just the flames coming off them). It makes it look brighter and not as static. I like to think (and correct me if I'm wrong) that it makes the fire a little blurrier, thus giving the eye the impression of being dazzled, thus implying unconsciously that the fire is very bright.
I realise I'm essentially saying 'go back and do it all again'. Don't feel disheartened, though, it'll look cooler if you do as I suggest. Lighting is very important, and it'll benefit you in future.