Like any other photo agency we curate the content sent by our contributors
We all see our work on a positive light
However, our trained editors look for good composition, excellent focus, correct captioning and keywording, similarity to other images, saleability, and other aesthetic or relevancy factors.
Those are the main reasons for rejecting your images.
A rejection is never personal. So please, learn from it and keep working. As you get working and gaining experience in our culture of acceptance you will see your rejections to go down