Sketch the flame you want to make. It doesn't have to be an exact replica of what I did, flames are random , for them to look real you have to be spontaneous . But keep in mind that this is just fire, burning , slowly, it tends to go upwards .
Get some graphite powder and smudge it around and in some places, inside the flames .It's easier to make bright flames on a dark background .
Whatever you used to smudge the background, use it again to make a few curvy smooth lines that go upwards .
Now using a sharp eraser make some bright lines inside and outside the flames. Make the lines sharp at the beginning and at the end, to get that fiery effect .
Now we're gonna make a different type a flame, one spewed out of a dragon's mouth or a flame thrower . Sketch it like a balloon .
As previous, using graphite powder , make a dark background around the fire.
Using an eraser, make white lines on the edges of the flame, starting from its source, yea the narrow white part on the left.
Do the same with the giant fire ball .
Add some more highlights for realism using a white pencil ( if you have one that actually works ) or white pastels .
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