Use a photograph or description you are allowed to process for this specific purpose. Remove unrelated people, identifying paperwork and unnecessary background details where practical. Keep the original separate from a working copy and check the current privacy and retention terms of any service before upload. A fictional text prompt is a useful practice option when consent for a real image is uncertain.
A practical checklist for consent, source permissions, expression, crop and final handoff when reviewing a playful illustrated portrait. Disclosure: I am associated with Caricature Maker, and AI assistance helped prepare these notes. Examples are fictional. Its site describes one free 1K generation and paid options; check current pricing and privacy terms.