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Tags: monster, 1boy
Additional tag: single claw
The claw inherits the issues related to how SD draws hands. With more than one character, it struggles to figure out which one to add the claw to. I can't improve it further. The workaround is to try different positions of "single claw" in the prompt order, or different seeds. Use hires fix for more detail.
Recommended quality tags: score_9, score_8_up, score_7_up, score_6_up. Optional: source_anime
Recommended negative tags: score_4, score_5. Optional: 3d, lips, realistic
Note that the end result ultimately depends on the base model used.