gritty graphic novel art, a warrior holding up his hand which has turned into the head of a fire breathing dragon and shouting "forefathers one and all, bear witness!" speech bubble
Sweet! I tried and modified your prompt to try to remove the hand and was able to get a decent result.
The prompt was:
gritty graphic novel art, a warrior holding up his the stomp of his cut off hand upon which has been attached the head of a fire breathing dragon and shouting "forefathers one and all, bear witness!" speech bubble. make sure no hand is holding the dragon’s head.