The lower parts of the legs feel stuck to the floor, the "inertia" should reach lower than it currently is...
The torso looks messy, since there are darker blobs that seem to be there without rhyme or reason. If the body is also going to be "fire in motion" (like a lava lamp, for example), you should animate those blobs upwards. (But I think this is not the case)
If instead the body is going to be "static" and "opaque", then you should remove those blobs, and maybe put them again in more justified positions: either representing folds in the skin or shadows cast on (although since it's supposed to be a incandescent body, it doesn't make much sense that it would have shadows)
The arms look weird, especially his left one. It looks too thin and bendy.
The face and head are fine by me
