I think you should take a look at the manga and look what kind of personality she has If you know that you can google for fitting poses or ask somebody who has a little more experience with posing in front of a camera
Don't listen to those who say, that you have to KNOW how to pose Everybody starts unknowing, what kind of posing looks good in front of a camera
Okay if you are going to cosplay as a character at least for the love of fucking god know their personality and figure it out that way if you don't then why the fuck are you cosplaying as someone you don't know. I find it important if the cosplayer themselves know the personality of the character well as it allows it to shine through in many photos.
Hinata from which arc? her attitude kinda changes throughout you know. For the most part, you'd do well in just trying some extremely shy poses. But if you want to go for later Hinata, you could also try some badass pose, or maybe pose while doing the seal for the byakugan.