The movie does make the somewhat unfortunate choice of a wrap-around story where the adult Flament (Emily DeQuenne) suffers fainting spells and goes to a female psychiatrist to recover memories of the sexual assault she suffered at 13. While I'm sure this is perfectly true, memories "recovered" by psychiatrists are probably the most suspect when it comes to false accusations of abuse. Psychiatrists have been known plant false memories of abuse in children and distorted memories of teenagers and adults. Regardless, cinematically, the flashback scenes with the young Flavia (Lou Gable) on the beach with her mother and sister where she was "discovered" and photographed by the already-famous photographer are far more compelling than the scenes of the adult Flavia talking to her psychiatist. And going back and forth between the present or past in such a short movie also tends to detract from this being a PERSONAL account (the strength of French films like "My Little Princess") because the movie simply doesn't spend enough time to develop a strong relationship with either the adult or the adolescent Flament (although Lou Gable fares better than Emilie Dequenne). The result is perhaps too much of a tilt from personal story to lurid sensationalism.
David Hamilton himself is at least not portrayed as an obvious mustache-twirling villain (and there have not been numerous accusations made against him, unlike with someone like Harvey Weinstein). It is a little shocking that Flavia's mother thinks nothing of leaving her adolescent daughter alone in the company of a nude middle age man (Hamilton apparently did his photography in the nude), even if he is a famous photographer and his wife was around. It's hard to imagine even in 1980's France, people were that naive or blase.
This movie is Flament's personal story and it deserves to be taken at face value, but I'm personally wary of this present-day trend of portraying the teenage girls of the past (and apparently their mothers) as impossibly naive victims and all men back then as nothing but predatory rapists. I'd at least recommend also watching Catherine Breillat's "36 Fillette", a similar film made back in the 80's-era setting of this film, which gives a different, and in my experience more believable, portrayal of the sexual mores of this era.