Dean said he was working on some stuff for GTA IV and asked me to give the bike to him. Just sayin'.
Well, mainly some more orangish layers to make it glow more. Then you could play with some filters, too, to make a slight distortion. Also a good idea is to downscale the fire and enlarge it again, since high quality fire doesn't really blend well with game poses.
And well just play around with it a bit more so it blends with the wheels better.
Won't be doing that now, but I'll remember that the next time I make fire.
How are the wings by the way? I had to draw them from scratch.