The shapes and color is perfect. I am not sure if you meant it or not, but I like the way you had it flow to the center. The colors are what defiantly show that. From bright to dark and then at the bottom how it flows out to red. Great fire like look and good job over all. I can't really think of anything to suggest.
Time and time again I give you the up most respect. It has nothing to do with the way the art looks, but every time you make a piece I can see the amount of effort you put into it.