line art by free line arts on DA
I've got one including a solid black background, but since the line-art is free I thought I'd just post the colored outcome and let others use it for free stock (just be sure to credit line artist!)
Had fun coloring this, was going for a flaming look but not 100% sure I hit the nail... instead of doing usual shading, I decided to use yellow for where it'd be lighted and red for where it'd be shaded (colors of flames) and the chocolate swirl pattern to give the flames texture.