Respuesta :
auront would mean that the photos will have great value later and seront means the photos will be of great value later, so whichever makes the most sense. I would say seront might make more sense but i’d say either could work in context.
Bonjour Suzy :-)
Answer:
Si Sophie devient célèbre, les photos que Max a prises d'elle auront une grande valeur plus tard.
Auront = verbe "avoir"