I like it, but I think it would be more impactive (is that even a word?) if it were rotated slightly, but still centered. Something about that design standing straight up makes it too default looking. I say rotate it about 12 degrees one way, preferably to the left.
This is almost an incredible design, but for me it's just that the outline isn't quite as clean the way the flames and bottom swirl is done. Perhaps an adjustment to the shading to make it a bit darker feeling would really nail it.
I don't know about sharpening the lines, but there is definitely something about the resolution that causes the design to suffer. Maybe its blurry in the "wrong way"? I dunno. I'd also like the flames to be bigger.
I love the idea, though. And this is a good start!