Here is an explosion tutorial as Leth requested, although I don't think I'm so good at explosions that I can teach how to draw them... But I can teach some of the principles behind them!
But the best thing to do is really to watch video of explosions. (Some links are supplied in the Flash)
Edit: I just learned that "flame" explosions are officially called BLEVEs (pronounced "blev-ee"), or Boiling Liquid Expanding Vapor Explosions. You can look up this term on youtube
to see a bunch of them!
Additionally, a deviant named ~ProfessorDoom
has commented about the collapsing of the mystery of gamma ray bursters (pun intended):
"The core of the hypernova collapses directly into a black hole and two extremely energetic jets of plasma are emitted from its rotational poles at nearly the speed of light. These jets emit intense gamma rays, and are a candidate explanation for gamma ray bursts. In recent years a great deal of observational data on gamma ray bursts significantly increased our understanding of these events, and made clear that the collapse model produces explosions that differ only in detail from more or less ordinary supernovae. Nevertheless, they continue to sometimes be referred to in the literature as hypernovae. The word hypernova itself was coined by S.E. Woosley. [link]
" Check the link for more information!