If you have any confusion at all about whether or not this is OK, just ask yourself what stage direction this little girl received from an adult professional in order to get this shot
Helping younger girls not feel ashamed of experiencing sexual feelings maybe? I know around that age I was starting to become a sexual creature and there was absolutely zero acknowledgement in culture that girls my age could be that
Yea I think it'd be awesome if adults could start acknowledging girls just starting puberty are becoming sexual creatures, if that had influenced the adults in my life that woulda been awesome
FWIW I *don't* think the adults in my life need to watch children do the first half of a strip routine, even if I think those children should have some breathing room when it comes to figuring out their sexual development amongst themselves.
There actually is a lot of content that's come out over the last few years that explores sexuality for young adults/teens in an appropriate, realistic, and non-sexualizing way like with Sex Education or Booksmart.