Безопасен ли nature-pictures.org?

I once had a project in class about polar animals. I found this site, which has some very beautiful pictures. Now, I'm in 8. grade, and I sent them a message and asked if I could use one of their pictures for a non-commercial purpose, only in a PowerPoint presentation in class. I got an answer in a couple of hours, saying that I had to subscribe to an image-sharing service to get the photo (which of course is extremely expensive). Even though it took me less than 30 seconds to rip the image off, I see no reason for not giving the image away, even if you want people to pay for it. Especially if you're in freaking 8 grade.