As far as I can see, there isn't anything to critique here. I can't find anything wrong with this piece. Everything looks so fantastic. The amount of detail is incredible, the colors are very vivid and eye-catching, and somehow you managed to keep the bodies in proportion. And it all comes together seamlessly. I would say this is one of your very finest works, if not the finest. I am extremely impressed.
Maybe someone else around here can find something you can improve on. If they do, they must have sharper eyes than mine. Me, I wouldn't change a thing here. I love this just the way it is!
Ah, a little lover's quarrel here, eh? Ha---well, as your other critiquer said, there isn't much to criticize here, as your work here is really very well-done. Dragon!Malificent and Snake!Jafar both look excellent, could have been lifted right out of their respective movies, and the fire effect not only makes the picture awesome but manages to tie in their color motifs. However, there is a negative side-effect in that the different colored backgrounds sort of divide the picture, so that at first glance this looks almost like two different images were just put together, a fact compounded by the fact that the bulk of their bodies are fairly far apart. Jafar's tail wrapped around Malificent and the castle in the background rectifies this somewhat, but the first impression is still a bit off.
Other than that, this picture is definitely excellent, and I applaud your ability to mix artistic skill with dramatic planning.