hi anon ! it's hinted that in canon edgar used his own blood to draw, i draw sh scars to show it ^^ his love to this color (the special meaning it holds for him and the symbolism) and desire to have at least some control in his life might be the reason he is doing this . to him he is not the art but an artist that sacrifices himself to achieve his "swan song", this leads him to his death in his canon game ❤...