if the pages/pics are not there then they are not there
google cache is a thing of the past, bing cache still works, in webpage snapshots you normally won't be able to see many pics
if you bookmarked the girl's page then you should try this first
i had the same intention like yours before, wanted to see what girls the asian escort agencies had in the past
typically each girl's profile would look something like www.agency1.com.au/our-girls/amy.html
if they don't delete that page after the girl's gone this becomes a what's called an orphan page (still online but no links to it) and you should still be able to view it if you know the URL
I remember using some tool called webcrawler/spider which digs out all pages/contents under a domain name
it did find me a few escorts in the past with pics but not a lot