Three heads conjoinment

Made a illustrious version. Added the 3 heads tag to training.

It seems to make too many heads often, but shouldn't be a problem if you use 0.9 strength or less.

Trained on 21 epochs, 567 steps and 3 repeats.

The model is able to make 4 and 5 headed girls at a 1.0-1.2 strength by changing the prompt to "4girls, 4 heads" or "5girls, 5 heads" but the background gets simpler.