Tazz
First, "lagality's" should be "legalities".

Second
I think you are on the right track with your concept, I have searched high and low for a free unrestricted source of images and frankly I failed.

However, your images aren't free as you state, people have to pay to be a member. If I had come across your site during my research I would have moved on swiftly.

If I was setting up a service like yours, I would want it to be genuinely free and unrestricted. As far as I am aware no other site offers this, it would be unique. (I'm sure others will put me right here if I am inaccurate in my assessment.)

You could generate income form such a site through advertising, possibly Google Adsense, in which case you definitely would need to know about meta tags and everything else that goes with SEO. This would take a lot of hard work but I think it would be worth it.

I think that you should also reconsider your ToS. For a service that is supposed to be free of restrictions there's a whole lot of restrictions.