I couldn’t resist this after @breadstickcat’s tag. There’s an old joke among some friends and me growing up that I had no soul. Sometimes the joke was that I never did, other times one of the guys, who was ginger, would joke about him stealing my soul.
As for glowing, I happily utilize different layers. Typically an upper layer being a “multiply” layer of a very dark colour (typically blue or purple) and above that a luminosity layer of a light or vibrant colour. This is all on PaintTool Sai, my preferred program, and other programs will most likely differ. Of course, at times, I don’t utilize the multiply layer; other layers with colour do enough to help the glowing to pop.
Anyway, I hope the doodle amuses you and the explanation helps a bit. No soul selling needed. Typically in my case, it’s just messing around until something looks good. Well, until next time!