In the course of browsing I've come across this Maritime Auction site - there are no doubt others. They are very skilled at their photography and could be a useful source of pictures of models, some of which are contemporaneous. Examples:-
1/36 HMS Siren, 1773 - https://www.charlesmillerltd.com/au...=0&au=53&ef=&et=&ic=False&sd=0&pp=48&pn=3&g=1
1/64 HMS Isis 1774 https://www.charlesmillerltd.com/au...=0&au=53&ef=&et=&ic=False&sd=0&pp=48&pn=3&g=1
1/36 HMS Siren, 1773 - https://www.charlesmillerltd.com/au...=0&au=53&ef=&et=&ic=False&sd=0&pp=48&pn=3&g=1
1/64 HMS Isis 1774 https://www.charlesmillerltd.com/au...=0&au=53&ef=&et=&ic=False&sd=0&pp=48&pn=3&g=1