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InfluxDB
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Reference-Only controlnet - doesn't do face-only (so the clothes, pose, environment etc have to be prompted into submission) and it often overpowers the prompt, less consistent with faces - but it can work for consistent characters. There's a ref only node in "ComfyUI experiments" which you can install through the manager.
IP adapter face model. To me, this is one of the most effective ways to get a consistent face, although it can be difficult to change the facial expression from the reference photo (but not impossible). You can also use the regular IPadapters (non-face) to maintain consistency in other characteristics, like clothes or background. Install IP Adapter Plus via the manager.