How to improve your photo
This is often a subjective call, but I would, if you have the software to do it, color balance this image to remove some of the slight magenta overtones in the smoke and clouds. If you like the color then of course don't do anything, but I think that the cast is somewhat distracting in this case.
Sometimes aircraft contrails work in an image. In this case there is one on the upper right of the sky that travels straight down and looks more like a blemish than a natural element in the scene. Consider cloning this out and thus remove a small distraction from your sky.
Its difficult to get an even exposure when shooting into the sun, even when it is obscured by smoke and clouds. Consider shooting a scene like this when the sun has just dropped below the horizon. There is still good light for the sky and clouds without the risk of having a blown out white hot spot in your sky. It will also make it easier to obtain better shadow detail. In this case you can do some post processing to minimize the brightness of the hot spot in your sky by layering and cloning or filling some of the white area with clouds matching the coronal area of the hot spot.
I think that you could safely crop out about 1/3 of the sky and thus improve the visual impact of the foreground and fire without giving up the beauty of the clouds and colors there. The composition would be more panoramic in orientation and also meld the two halves of the composition, sky and fire, a little better.