Now that's a man's flashlight.
This is an okay image, but there's plenty of light not from the headlamp, so it isn't clear the head is being used for a light source. There is a glow in the head, sure, but no beams of light or other thing that would indicate it having brightness. (Also, I generally prefer not
having images of roughly severed heads dripping blood, but maybe that's just me. It isn't too graphic or whatever, though.)
Therefore, I'd like to suggest the last panel
of the most recent Ears for Elves
comic. It's clearly dark except where the orbs are, and the magic is shown through the swirlyness around them. You can even tell someone is invoking it as Tanna is standing right there and such. If people think it would be better, we could use the second panel as well, but I don't consider it necessary.