Try Oekakibbs! despite it's quirks, it's pretty nice. And you can basically make the same effects as Paintbbs in it. And maybe flames are easier to draw in Oekaki, but i wouldn't know. Jest a tip.
K, I'll definately try it. The smear affect in oekaki is awesome for drawing realistic fire, my only concern with it is last time i drew something it messed up the animation and I couldn;t edit the picture. :(
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