so I've been trying to make a headless horseman since SDXL 1.0 was first introduced. Fail after fail. However it looks like Imagen Fast can make a Dullahan quite easily. And with prompt magic on, the details are even better.
Sleepy Hollow Dullahan, headless rider wearing a black 18th century high collar jacket and cape, riding on a demonic black horse galloping through a misty forest, headless horseman holding a flaming pumpkin. horror, color depth, dramatic. by Brian Mashburn, Alan Lee , Darek Zabrocki. 8k, hdr