Is this okay for 8-11 year old girls to see?

I think that you will be absolutely fine to take them. You can see real, live Angelina Jolie tatas any day, wonderwoman only has curved, well shaded lines. Honestly, to a lot of young girls, and older ones, WonderWoman is a huge inspiration, before her, there weren't a lot of females known for kicking *** and taking names. If the camp says anything to you, then put it away, simple as that. All that I know is that I wanna go to that camp! Sounds like a blast!