Here is some process work.
Initially I had a pretty different idea with a large monster behind the main figure. That was scrapped and a larger scene with more figures and depth was worked out.
We also played around with the main figure and how he should fit in the scene. In the end I opted to have him set back more in the haze of fire.
Here is the final pencil before I got into all the layered figures.
Finally, here is how all the layered played out.