Nice dynamic movement. Movement is good (sometimes, I guess, unless you want stillness). At the very least, it's good here.
Try to stray away from the textured brushes/background textures. Save those for when you nail down using plain ol' regular brushes. It's meant to add flair, but not as the basis for a painting. If you want the feeling of fire, paint it like fire. Don't rely on textures.
Also, it looks like you painted over a 3d model. What was your reference?
The blue light doesn't seem to be coming from anywhere. When using reference, make sure you transform it to fit the scene, not the other way around.
Good start, and keep it up!