Hello, none of the photos were accepted due to poor quality. What is the reason?

These are all underexposed, with some lighing and compositional issues as well.

Lighting is uneven.

Too dark in places.

Not much warmth or visual interest.

Compare yours to a similar photo in Stock inventory.  What does this image have that yours doesn't? 

First one: exposure, focusing, and a composition that is too busy.

Did you add the lighting effects manually? That's usually not a good idea.