Here are some examples of how you can add details to the fire effect I have shown in the following tutorials:
Scattered Soft Brush as Sparkles
Use a soft brush and change the brush settings to get it scattering. This often results in a nice looking magical effect.
Dust as Sparkles
Use dust brushes or overlays to add some glimming sparkles to your fire. When using real dust, this results in a nice and natural effect.
Use another Solid colored layer with blend mode “Color” to colorize your fire. Especially blue and green look very great in combination with this fire effect.
Add yome burst to your fire to create an explosive effect. The brushes
Add smoke to your fire to to create a more special effect. In below example I used the color “#e3f7ff” to make the smoke look a bit more natural.