The problem here is that you can not enter Pinterest to view photos unless you have an account. While usually, we would understand why they would do this, as a way to get more subscribers to their site, it makes little sense because their photos are all over google searches anyways.
So that means we technically never need to make an account with Pinterest because we can just go on google images, but going directly to the site would make things a lot easier. Unfortunately, they do not want to offer that convenience unless you sign up. Why do they insist on making things so difficult?