I told myself near the beginning of making this that I did not want her resemble any of the headless characters I've drawn in the past. Apparently I forgot about that when I got around to drawing her hair. But oh well, I guess the flame can work as a distinguishing feature.
I should totally make more drawings with glowy things in dark settings, by the way. If only I could think of more cool glowy things I'd want to draw.
Also, I think this might be the only drawing I've seen where a dullahan's flame is the dominant source of light. If anyone finds any other examples, I'd be interested to know.