Try size: 768 x 768 (SD 1.5) / 1024 x 1024 (Pony and ILXL and OOO)
Weights: 0.8~1
Clip skip: 2
Training material from bing
Pictures from CalicoMix V8.5 and CalicoMixPonyXL_v10 and CalicomixEroill_v25 and OOO_v80
Note: The success rate is about 1/3~1/5, so you have to try more times. The head disappears from time to time for unknown reasons. (SD 1.5)
Note: Improved some cases where heads would disappear from time to time, but not 100%. (SD 1.5 Fix)
Note: The "grey sky" will cause grayscale. Sometimes the corpse will be in mid-air. (ILXL)
Reference Video: