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.
That's without saying how many anime fans and cosplayers actually reside on DA, (Let me tell ya a lot). So she was in a good chance of just saying what she did and knowing sooner or later some otaku would catch wind of "Hinata" in a forum. Thanks for the input.
But on to your question Cutegoth777, from what I remember of her character being shy and very avoiding of naruto, you could spot yourself a Naruto cosplayer at a con an get a picture of him, but with your cosplaying as Hinata in the background trying to spy on him or swoon or what she did. But if that isn't an option an easy thing you could try is just watch episodes with her in it and manga chapaters. Watch her mannerisms and attitude when she is in a scene or in a still frame. I'm sure that will help in the long run. And tell me if it works ^_^