There is no correct answer.
However, as others have pointed out, I too would opt for domain.com/model/lisa-ann/, but then again, if I was really trying to finely tune my SEO, the term "Lisa Ann model" is likely to be significantly more saturated results than alternatives.
The white hat way would be figure out which slug your feel best describes your sites structure and the content on that page, which once again is likely to point you in the direction of "model" slug.
Try both, plus alternatives, test and find the answer that best delivers relevant traffic and conversions to your site.
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