I´m new to this and these photos were rejected due to quality problems, could someone help me tell me why?
[moderator cured HTML formatting error]
Read the Adobe stock help pages. Monochrome conversions are not accepted.
Adobe does not usually accept black-and-white monotone photographs. The potential customer is looking for color content or prefers to edit the material himself if necessary.
In addition to being black and white, you should check your histogram:
Submit the colour version of the files with a correct histogram, and you report back. You have a good chance to get those accepted.
Read these links. Pay particular attention to the DOs & DON'Ts.