I am not sure, but given the style of the photo (shot outdoors- European looking model- and an AMAZING booty) google an amateur model's site "Big Butt Atinna"
I used to be a fan long ago. Atinna is a greek model who just does posing. She had a hand full of other curvy Euro girls. But be warned- not only is the site "Big Butt themed" it is also devoted to HAIRY girls. Some content is very good- but the hairy stuff is a turn off to me.
Girl looks familiar, and I think I have seen her there. If not- you ill find others like her.