Attached Link: http://www.dodger.org/Recent%20Art/pics/sin.jpg

DON'T USE the eye candy fire. Ewww! They said they wanted Fire, not that crud Eye Candy makes.

Fire is easy with or without a tablet, though tablets are always faster and more fun.

Do this:

make a new layer

using a relatively hard brush, blot in the white points of the fire. The hottest bits.

Use the smudge tool (at 100% with tablet or 65%-85% pressure without) to smear the white about. Make it look like smoke. Fire is merely glowing smoke.

Now to make it glow...
Add a layer below this layer. Fill it with black. Merge the smoke down.

Change the merge mode of the combined layer to screen.

Adjust hue/saturation. Colourise mode. Turn up the saturation really high and set the colour to a colour you'd want.