the painting isn't just about colors and flames, we have many elements, but if there is a start position for flames then i believe that it should be the lower left G swirl for many reasons: firstly this is the only G that has fire inside it and the flames to the right (bottom edge) is longer and bigger, whereas on left side edge becomes smaller and fewer even they can't cause any harm to the 2 leafs, notice that we have 2 leafs inside left edge and only one inside top edge, in right edge one leaf just touches the edge, and no leafs inside bottom edge, and we have that queen piece melting as the flames in the bottom edge are stronger. lastly i can clearly see number 2 on the upper edge of the lower right G swirl (after zoom in) which refers to the order of G swirls and direction... ((lower left G is the first then lower right then upper right then upper left))