I draw my demon boy character Yarmu with rainbow colored background, and I draw this art in 2021. first I think to draw the simple autumn breeze effect but on the way I enjoy drawing the color flow going along with the line of spear and his tail, and I add the various color and it's no longer the autumn color, it's the rainbow color. first I think I fail to color the background because it's different from my first intention but now I think it become pretty good.