this is how I do it. #1 rule of thumb for me, I hate "reverse fire".
Fire is lighter the hotter it gets, so the bottom/lower center of your flame should be white or lighter yellow (depending how hit it should simulate). Then along each of the licks of flame, I start to blend up from yellow to orange to red at the very tips. Then lightly drybrush very very little black for the "burnoff" of the flame from the more reddish part of the fire.
Now the "reverse fire" which i hate is pretty popular in painting. And it follows convential highlighting, but real fire does not contain natural highlights so to speak. Reverse fire starts with the red at the bottom/lower center of the the flame and then builds up highlights to a yellow or white at the tips of the licks of flame.
Either way is acceptable and with a little work, fire can look great. I just really prefer real fire over the reverse.
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